Note: Descriptions are shown in the official language in which they were submitted.
.k
.",
CA 02314121 2000-08-O1
1
SALICYLIC ACID DERIVATIVE AND ITS USE AS INTERMEDIATE FOR
THE PREPARATION OF SALICYLALDEHYDE DERIVATIVE
This application is a division of application
serial no. 2,018,960 filed June 13, 1990, which relates to
salicylaldehyde or salicylic acid derivative and their
sulfur analogs of the formula I
A 0
R1
X~N~R 1
Y ~I'Z
where R3
R1 is hydrogen;
succinyliminooxy;
a 5-membered heteroaromatic radical containing from one
to three nitrogen atoms which may carry from one to four
halogen atoms and/or one or two of the following
radicals : C1-C,-alkyl, C1-C,-haloalkyl, C1-C,-alkoxy,
C1-C4-haloalkoxy and/or C1-C"-alkylthio;
a radical -ORs or a radical ON=CR°R', where
R' is hydrogen, an alkali metal cation, one equivalent of
an alkaline earth metal cation or an organic ammonium
ion;
C~-C12-cycloalkyl which may carry from one to three Cl-C,-
alkyl radicals;
C1-Cla-alkyl which. may carry from one to five halogen
atoms and/or one of the following radicals: C1-C~-alkoxy,
C1-C~-alkylthio, cyano, Cl-C°-alkylcarbonyl, C1-C°-alkoxy-
carbonyl, C3-C1Z-cycloalkyl, phenyl, phenoxy or phenyl-
carbonyl, where the aromatic radicals may in turn carry
from one to five halogen atoms and/or from one to three
of the following radicals: C1-C,-alkyl, C1-C,-haloalkyl,
C1-C~-alkoxy, C1-C,-haloalkoxy and/or C1-C,-alkylthio;
C1-Cio-alkyl which may carry from one to five halogen
atoms and carries one of the following radicalsa a 5-
membered heteroaromatic radical containing from 1 to 3
CA 02314121 2000-08-O1
.. ~. ,
- 2 -
nitrogen atoms which may carry from one to four halogen
atoms and/or one or two of the following radicals : C1-C,-
alkyl, C1-C,-haloalkyl, C1-C,-alkoxy, C1-C,-haloalkoxy
and/or C1-C,-alkylthio;
C2-C°-alkyl which carries one of the following radicals in
the 2-position: C1-C°-alkoxyimino, C3-C°-alkenyloxyimino,
C3-C°-haloalkenyloxyimino or benzyloxyimino;
C3-C°-alkenyl or C3-C°-alkynyl, where these groups may in
turn carry from one to five halogen atoms;
phenyl which is unsubstituted or~monosubstituted to tri-
substituted by C1-C,-alkyl or by C1-C,-alkoxy or mono-
substituted to pentasubstituted by halogen;
R° and R' are each C1-C2o-alkyl which may carry phenyl,
C1-C,-alkoxy and/or C1-C,-alkylthio, or are each phenyl or
together form a C3-C12-alkylene chain which may carry from
one to three C1-C3-alkyl groups;
R2 and R' are each C1-C,-alkyl, C1-C,-haloalkyl, C1-C,-
alkoxy, C1-C,-haloalkoxy and/or C1-C,-alkylthio;
X is oxygen or sulfur;
Y and Z~ are each nitrogen or a methine group =CH-;
R' is hydrogen, halogen, C1-C,-alkyl, cyano or C1-C,-halo-
alkyl;
A is an unsubstituted or monosubstituted to trisub
stituted, or with halogen as substituent, monosubstituted
to pentasubstituted phenyl radical
R9
R8 ~ R10
R11
R11
where R° to R12 are each hydrogen, halogen, cyano or
nitro;
C3-C°-alkenyl, C3-C°-alkenyloxy, C3-C°-alkynyloxy or
C3-C°
alkynyl, where these groups may in turn carry from one to
five halogen atoms;
di-Cl-C,-alkylamino or C3-C°-cycloalkyl which may carry
from one to three C1-C,-alkyl radicals;
C1-Clo-alkoxycarbonyl or C1-C,-alkylthio;
.~
. ~.
CA 02314121 2000-08-O1
- 3 -
phenoxy, where the aromatic radical may carry from one to
five halogen atoms and/or from one to three of the
following radicals : C1-C,-alkyl, C1-C4-haloalkyl; Ci-C,-
haloalkoxy; C1-C,-alkoxy or C1-C,-alkylthio; and
Cl-Clo-alkyl or alkoxy which .may carry from one to five
halogen atoms and/or one of the following radicals:
C1-C,-alkoxy, C1-C,-alkylthio, phenyl or phenoxy, Where the
aromatic radicals may in turn carry from one to five
halogen atoms and/or from one to three of the following
radicals : C1-C4-alkyl, C1-C'-haloalkyl, C1-C~-haloalkoxy
or C1-C~-alkylthio;
or A is a 5-membered heteroaromatic radical having from
2 to 4 nitrogen atoms or one or 'two nitrogen atoms and
additionally one sulfur or oxygen atom fn the ring, which
may carry from one to three halogen atoms and/or from one
to three of the following radicals: vitro; cyano, C1-C,-
alkyl, C1-C,-alkylthio, C1-C~-haloalkyl or phenyl which is
unsubstituted or substituted by from one to three halogen
atoms and/or from one to three methyl groups;
thienyl which may carry from one to three halogen atoms
and/or from one to three of the following radicals:
C1-C,-alkyl, C1- or CZ-haloalkyl or vitro;
pyridyl which may carry from one to three halogen atoms
and/or from one to three of the following radicalss
C1-C,-alkyl, C1- or CZ-haloalkyl or vitro;
a naphthyl, quinolyl, indazolyl or benzotriazolyl radi-
cal, each of which may carry from one to three halogen
atoms and/or from one to three of the following radicals:
C1-C,-alkyl or C1- or CZ-haloalkyl,
and environmentally compatible salts of the compounds I.
The present invention as claimed hereinafter
relates to novel salicylic acid derivatives of the
formula II'
A 0
R4 ~ _R5 II'
CA 02314121 2000-08-O1
- 4 -
as intermediates for the preparation of the compounds I.
In the formula II',
R3 is hydrogen, an alkali metal cation, one equivalent of
an alkaline earth metal cation or an organic ammonium
ion;
Ci-Clo-alkyl which may carry from one to five halogen
atoms and/or one of the following radicals: C1-C,-alkoxy,
C1-C,-alkylthio, phenyl or phenoxy, where the phenyl
radicals may each carry from one to five halogen atoms
and/or from one to three of the following radicals:
C1-C,-alkyl, C1-C,-haloalkyl, C1-C,-alkoxy, C1-C,-haloalkoxy
and/or C1-C,-alkylthio;
R~ is hydrogen, halogen, C1-C,-aikyl, cyano or C1-C,-
haloalkyl;
A is a monosubstituted to trisubstituted or, where the
substituent is halogen, monosubstituted to pentasub-
stituted phenyl radical
Rg
R8 I ~ R10
R11
where R 12
Re to R12 is hydrogen, halogen, cyano or vitro;
C3-CB-alkenyl, C3-Cs-alkenyloxy, C3-C~-alkynyloxy or C3-C6-
alkynyl, where these groups in turn may carry from one to
five halogen atoms;
di-C1-C,-alkylamino or C3-Ce-cycloalkyl which may carry
from one to three C1-C,-alkyl radicals;
Cl-Clo-alkoxycarbonyl or C1-C,-alkylthio;
phenoxy, where the aromatic radial may carry from one to
five halogen atoms and/or from one to three of the
following radicals s C1-C,-alkyl, C1-C,-haloalkyl, C1-C,-
haloalkoxy, C1-C,-alkoxy or C1-C,-alkylthio;
a C1-Cio-alkyl or alkoxy group which may carry from one to
five halogen atoms and/or one of the following radicals:
C1-C,-alkoxy, Cl-C,-alkylthia, phenyl or phenoxy, where the
aromatic radicals may in turn carry from one to five
CA 02314121 2000-08-O1
- 5 -
halogen atoms and/or from one to three of the following
radicals : C1-C~-alkyl, C1-C,-h~loalkyl, C1-C,-haloalkoxy
or Cl-C~-alkylthio;
with the p=oviso that RS is not hydrogen or alkyl when
all radicals R° to R12 are hydrogen;
or A is a 5-membered heteroaromatic radical having from two to
four nitrogen atoms or one or two nitrogen atoms and
additionally a sulfur or oxygen atom in the ring, which
may carry from one to three halogen atoms and/or from one
to three of the following radicals: vitro, cyano, C1-C,-
alkyl, C1-C4-alkylthio, C1-C~-haloalkyl or phenyl which is
unsubstituted or substituted by from one to three halogen
atoms and/or one to three methyl groups;
thienyl which may carry from one to three halogen atoms
.and/or from one to three of the following radicals:
C1-C,-alkyl, C1- or C2-haloalkyl. or vitro;
pyridyl which may carry from one to three halogen atoms
and/or from one to three of the following radicals:
Cl-C~-alkyl, C1- or CZ-haloalkyl or vitro; with the proviso
that a 3-pyridyl radical carries one or more of the
stated substituents;
a naphthyl, quinolyl, indazolyl or benzotriazolyl
radical, each of which may carry from one to three
halogen atoms and/or from one to three of the folt6wing
radicals: C1-C,-alkyl or C1- or C2-haloalkyl.
In the literature (EP-A 223 406, EP-A 249 708,
EP-A 287 072 and EP-A 287 079) describes herbicidal sub-
stituted salicylic acids and their sulfur analogs. How-
ever, their action is unsatisfactory.
It is an object of the present invention to pro-
vide novel salicylic acid derivatives or their sulfur
analogs having improved herbicidal properties and pos-
sessing plant growth-regulating properties.
We have found that this object is achieved by the
compounds of the formula I, defined at the. outset. We
have also found processes for the preparation of the
compounds I and methods for controlling undesirable plant
CA 02314121 2000-08-O1
- 6 -
growth using the compounds I. We have furthermore found
that salicylic acid derivatives of the general formula I
defined above have excellent plant growth-regulating
properties:. The novel salicylic acid derivatives II'
have been found as intermediates for the preparation of
the compounds I.
Compounds of the formula I are obtained, for
example, by reacting an appropriately substituted
salicylic acid derivative of the formula II, which in
specific cases is known or can beprepared by con-
ventional methods starting from known intermediates, with
an appropriate compound of the fonaula III in the
presence of a base.
A 0 R 13~~~R 2
R4 ~ Ri IY~I/Z Base ~ I
' XH R3 -HR13
II III
In formula III, R1' is a conventional nucleofugic
leaving group, for example halogen, such as chlorine,
bromine or iodine, aryl- or alkylsulfonyl, such as
toluenesulfonyl or methylsulfonyl, or another equivalent
leaving group. Compounds of the formula III having a
reactive substituent R1' are known or are readily obtain-
able on the basis of the general technical knowledge.
Suitable bases are alkali metal or alkaline earth metal
hydrides, such as.NaH or CaH2, alkali metal hydroxides,
such as NaOH and KOH, alkali metal alcoholates, such as
potassium tart-butylate, alkali metal carbonates, such as
NazC03 and KZC03, alkali metal amides, such as NaNH2 and
lithium diisopropylamide, or tertiary amines. When an
inorganic base is used, a phase transfer catalyst may be
added if it promotes conversion.
Where the compounds of the formula I prepared in
the manner described are carboxylic acids (ie. when R1 is
hydroxyl), they can also be converted into other com
pounds described, for example by first converting the
.<
CA 02314121 2000-08-O1
-
carboxylic acid in a conventional manner into an
activated form, such as a halide or imidazolide, and then
reacting this with the corresponding hydroxy compound.
These~two steps can also be simplified, for example, by
allowing the carboxylic acid to act on the hydroxy com-
pound in the presence of a water-eliminating agent, such
as a carbodiimide.
When X is oxygen and A is a heteroaromatic or
aromatic radical bonded via a carbon atbm, the inter
mediates of the formula II can be synthesized according
to the scheme below, from a 1,3-dicarbonyl compound IV
(where R3 is unsubstituted or phenyl-substituted C1-Clo-
alkyl, in particular C1-C~-alkyl) :and an a,fi-unsaturated
ketone Vs
r
A 1 Basa A 0
+ ~ R4 2 Acid
3 Broa~ine R ~ R5
II~
ORS ~ 4) -HB~ ~ H
IV V (A = heteroaromatic or
aromatic radical bond-
ed via carbon atom)
Alternatively, the intermediates of the formula
II' can also be prepared according to the scheme below,
from a methylenephosphorane IV' and an a,A-unsaturated
ketone Vs
PPh 3
w 1) Base A 0
+ I R4 Phi R4 ~ _R5
ORS p Z) 9~o~ine ~ ~ III
-H8~ , H
IV' V
(A = heteroaromatic or
aromatic radical bond-
ed via carbon atom)
The compounds IV, IV' and V are generally known
or can readily be prepared by conventional processes.
CA 02314121 2000-08-O1
- $ -
Suitable bases are the abovementioned compounds.
Suitable acids are strong acids', for example hydrochloric
acid, hydrobromic acid, tetrafluoboric acid, toluenesul-
fonic~ acid or trifluoroacetic acid. Elimination of
hydrogen bromide can be carried out thermally or in the
presence of a base, for example an organic amine.
If, in formula II, A is a heteroaromatic radical
bonded via a nitrogen atom and X is oxygen, this inter
mediate can be synthesized according to the following
scheme:
A 0
R4 I ~ R1
N
R 4 ~ C~J ~ I I b
(A = hetero-
VI aromatic radical
+A- bonded via N)
A
Reaction conditions
R ~ ~ ~ a) - c)
YII
a) 1. HC1/Ethanol b) 1. OH-/Water c) 1. H+/Water
2. HCl/Water 2. H+/Water 2. HHr, HI or
3. BHr3 3. HHr, HI or BBr3 HHr3
M+A- is the particular alkali metal azolide.
Suitable alcohols for the cleavage of the nitrile VII in
variant a) are, in particular, C1-C,-alkyl alcohols.
The intermediates of the formula II which ate
prepared as described above are usually obtained as alkyl
esters. These can be hydrolyzed by the known methods to
give the carboxylic acids. The latter can then be con-
verted by conventional methods into various esters, which
are required for the preparation of active ingredients of
the formula I as claimed in claim 1.
. c
CA 02314121 2000-08-O1
- g -
Alternatively, the intermediates of the formula
VII can also be reacted by generally known methods with
alkali metal or tetraalkylammonium hydroxides to give the
corresponding amides, and then with mineral acids, for
example concentrated hydrochloric acid, to give the car-
boxylic acids, and then with concentrated hydrobromic
acid to form the salicylic acids IIb. These steps can,
if required, be carried out without isolating the inter-
mediates.
Because of their herbicidal activity, preferred
compounds I are those in which
R1 is hydrogen, succinyliminooxy,
a 5-membered hetaryl radical, such as pyrrolyl, pyrazol
yl, imidazolyl or triazolyl, in particular imidazolyl or
pyrazolyl, where the aromatic radical is bonded via
nitrogen and in turn may carry from one to four halogen
atoms as stated above, in particular fluorine and chlor-
ine and/or one or two of the following radicalss
alkyl, such as methyl, ethyl, propyl, 1-methylethyl,
butyl, 1-methylpropyl, 2-methylpropyl or 1,1-dimethyl-
ethyl, preferably methyl, ethyl or 1-methylethyl,
haloalkyl, such as fluoromethyl, difluoromethyl, tri-
fluoromethyl,chlorodifluoromethyl,dichlorofluoromethyl,
trichloromethyl, 1-fluoroethyl, 2-fluoroethyl, 2,2-di-
fluoroethyl,2,2,2-trifluoroethyl,2-chloro-2,2-difluoro-
ethyl, 2,2-dichloro-2-fluoroethyl, 2,2,2-trichloroethyl
or pentafluoroethyl, in particular difluoromethyl or
trifluoromethyl, 2,2,2-trifluoroethyl or penta-
fluoroethyl,
alkoxy as stated above, of one to four carbon atoms,
haloalkoxy, such as difluoromethoxy, trifluoromethoxy,
chlorodifluoromethoxy, dichlorofluoromethoxy, 1-fluoro-
ethoxy, 2-fluoroethoxy, 2,2-difluoroethoxy, 1,1,2,2-
tetrafluoroethoxy,2,2,2-trifluoroethoxy,2-chloro-1,1,2-
trifluoroethoxy or pentafluoroethoxy, in particular tri-
fluoromethoxy, and/or
alkylthio, such as methylthio, ethylthio, propylthio, 1-
. r
CA 02314121 2000-08-O1
- 10 -
methylethylthio, butylthio, 1-methylpropylthio, 2-methyl-
propylthio or 1,1-dimethyhethylthio, in particular
methylthio or ethylthio;
a radical OR', where
R' is hydrogen, a cation of an alkali metal or a cation
of an alkaline earth metal, such as lithium, sodium,
potassium, calcium, magnesium or barium, or an environ-
mentally compatible organic ammonium ion;
alkyl, in particular methyl, ethyl, propyl, 1-methyl
ethyl, butyl, 1-methylpropyl, 2-methylpropyl, 1,1-di
methylethyl, n-pentyl, 1-methylbutyl, 2-methylbutyl, 3
methylbutyl, 1,2-dimethylpropyl, 1,1-dimethylpropyl, 2,2
dimethylpropyl, 1-ethylpropyl, n-hexyl, 1-methylpentyl,
2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,2
dimethylbutyl, 1,3-dimethylbutyl, 2,3-dimethylbutyl, l,l-
dimethylbutyl, 2,2-dimethylbutyl, 3,3-dimethylbutyl,
1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-ethyl-
butyl, 2-ethylbutyl, 1-ethyl-2-methylpropyl, n-heptyl, 1-
methylhexyl, 2-methylhexyl, 3-methylhexyl, 4-methylhexyl,
5-methylhexyl, 1-ethylpentyl, 2-ethylpentyl, 1-propyl-
butyl and octyl, which may carry from one to five of the
abovementioned halogen atoms, in particular fluorine and
chlorine, and/or one of the following radicalsr
cyano, alkoxy or alkylthio of one to four carbon atoms,
as stated above, in particular methoxy, ethoxy, 1-methyl
ethoxy or methylthio;
alkylcarbonyl, in particular methylcarbonyl, ethyl-
carbonyl, propylcarbonyl, 1-methylethylcarbonyl, butyl-
carbonyl,l-methylpropylcarbonyl,2-methylpropylcarbonyl,
1,1-dimethylethylcarbonyl,pentylcarbonyl,l-methylbutyl-
carbonyl, 2-methylbutylcarbonyl, 3-methylbutylcarbonyl,
1,1-dimethylpropylcarbonyl, 1,2-dimethylpropylcarbonyl,
2,2-dimethylpropylcarbonyl,l-ethylpropylcarbonyl,hexyl-
carbonyl,l-methylpentylcarbonyl,2-methylpentylcarbonyl,
3-methylpentylcarbonyl, 4-methylpentylcarbonyl, 1,1
. dimethylbutylcarbonyl, 1,2-dimethylbutylcarbonyl, 1,3
dimethylbutylcarbonyl, 2,2-dimethylbutylcarbonyl, 2,3
.z
CA 02314121 2000-08-O1
- 11 -
dimethylbutylcarbonyl, 3,3-dimethylbutylcarbonyl, 1-
ethylbutylcarbonyl, 2-ethyTbutylcarbonyl, 1,1,2-
trimethylpropylcarbonyl, 1,2,2-trimethylpropylcarbonyl,
1-ethyl-1-rRethylpropylcarbonylorl-ethyl-2-methylpropyl-
carbonyl;
alkoxycarbonyl, such as methoxycarbonyl, ethoxycarbonyl,
propoxycarbonyl, 1-methylethoxycarbonyl, butyloxy-
carbonyl, 1-methylpropyloxycarbonyl, 2-methylpropoxy-
carbonyl, 1,1-dimethylethoxycarbonyl, n-pentyloxycarbon-
yl, 1-methylbutyloxycarbonyl, 2-methylbutoxycarbonyl, 3-
methylbutoxycarbonyl, 1,2-dimethylpropoxycarbonyl, 1,1-'
dimethylpropoxycarbonyl, 2,2-dimethylpropoxycarbonyl, 1-
ethylpropoxycarbonyl,n-hexyloxycarbonyl,l-methylpentyl-
oxycarbonyl, 2-methylpentyloxycarbonyl, 3-methylpentyl-
oxycarbonyl, 4-methylpentyloxycarbonyl, 1,2-dimethyl-
butoxycarbony1,1,3-dimethylbutoxycarbony1,2,3-dimethyl-
butoxycarbonyl,l,l-dimethylbutoxycarbony1,2,2-dimethyl-
butoxycarbonyl, 3,3-dimethylbutoxycarbonyl, 1,1,2-tri-
methylpropoxycarbonyl, 1,2,2-trimethylpropoxycarbonyl,
1-ethylbutoxycarbonyl, 2-ethylbutoxycarbonyl, 1-ethyl-2-
methylpropoxycarbonyl, n-heptyloxycarbonyl, 1-methyl-
hexyloxycarbonyl, 2-methylhexyloxycarbonyl, 3-methyl-
hexyloxycarbonyl, 4-methylhexyloxycarbonyl, 5-methyl-
hexyloxycarbonyl, 1-ethylpentyloxycarbonyl, 2-ethyl-
pentyloxycarbonyl, 1-propylbutoxycarbonyl or octyloxycar-
bonyl, in particular methoxycarbonyl, ethoxycarbonyl, 1-
methylethoxycarbonyl or 1-methylpropoxycarbonyl;
phenyl, phenoxy or phenylcarbonyl, where these aromatic
radicals may in turn carry from one to five halogen atoms
as stated above, in particular fluorine, chlorine or
bromine, and/or from one to three of'the following radi-
cals s
alkyl, haloalkyl, alkoxy, haloalkoxy and/or alkylthio,
each of one to four carbon atoms, as stated above in
general and in particular, or
C1-Clo-alkyl, as stated above, which may carry from one to
five halogen atoms, such as fluorine, chlorine, bromine
.z
CA 02314121 2000-08-O1
- 12 -
or iodine, in particular fluorine or chlorine, and addi-
tionally carries one of the following radicals:
a 5-membered hetaryl radical having from one to three
nitrogen atoms, as stated above for R1;
CZ-Cg-alkyl, in particular CZ-C,-alkyl, which is sub-
stituted in the 2-position by C1-C6-alkoxyimino, eg.
methoxy-, ethoxy- or propoxyimino; C3-Ce-alkenyloxyimino,
such as 2-propenyloxyimino, 2-butenyloxyimino or 3-
butenyloxyimino; C3-CB-haloalkenyloxyimino, such as 3,3-
dichloro-2-propenyloxyimino, 2,3,3-trichloro-2-propenyl-
oxyimino or benzyloxyimino;
alkenyl, such as 2-propenyl, 2-butenyl, 3-butenyl, 1-
methyl-2-propenyl, 2-methyl-2-propenyl, 2-pentenyl, 3-
pentenyl, 4-pentenyl, 1-methyl-2-butenyl, 2-methyl-2-
butenyl, 3-methyl-2-butenyl, 1-methyl-3-butenyl, 2-
methyl-3-butenyl, 3-methyl-3-butenyl, 1,1-dimethyl-2-
propenyl, 1,2-dimethyl-2-propenyl, 1-ethyl-2-propenyl, 2-
hexenyl, 3-hexenyl, 4-hexenyl, 5-hexenyl, 1-methyl-2-
pentenyl, 2-methyl-2-pentenyl, 3-methyl-2-pentenyl, 4-
methyl-2-pentenyl, 1-methyl-3-pentenyl, 2-methyl-3-
pentenyl, 3-methyl-3-pentenyl, 4-methyl-3-pentenyl, 1-
methyl-4-pentenyl, 2-methyl-4-pentenyl, 3-methyl-4-
pentenyl, 4-methyl-4-pentenyl, 1,1-dimethyl-2-butenyl,
l,l-dimethyl-3-butenyl, 1,2-dimethyl-2-butenyl, 1,2-
dimethyl-3-butenyl,l,3-dimethyl-2-buteny1,1,3-dimethyl-
3-butenyl, 2,2-dimethyl-3-butenyl, 2,3-dimethyl-2-
butenyl, 2,3-dimethyl-3-butenyl, 1-ethyl-2-butenyl, 1-
ethyl-3-butenyl, 2-ethyl-2-butenyl, 2-ethyl-3-butenyl,
1,1,2-trimethyl-2-propenyl, 1-ethyl-1-methyl-2-propenyl
and 1-ethyl-2-methyl-2-propengl, in particular 2-
propenyl, 2-butenyl, 3-methyl-2-butenyl and 3-methyl-2-
pentenyl;
alkynyl, such as 2-propynyl, 2-butynyl, 3-butynyl, 1
methyl-2-propynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 1
methyl-3-butynyl,2-methyl-3-butynyl,l-methyl-2-butynyl,
l,l-dimethyl-2-prvpynyl, 1-ethyl-2-propynyl, 2-hexynyl,
3-hexynyl, 4-alkynyl, 5-hexynyl, 1-methyl-2-pentynyl, 1-
CA 02314121 2000-08-O1
- 13 -
methyl-3-pentynyl, 1-methyl-4-pentynyl, 2-methyl-3-
pentynyl, 2-methyl-4-pentynyl,., 3-methyl-4-pentynyl, 4-
methyl-2-pentynyl, l,l-dimethyl-2-butynyl, 1,1-dimethyl-
3-butynyl,: 1,2-dimethyl-3-butynyl, 2,2-dimethyl-3-
butynyl, 1-ethyl-2-butynyl,l-ethyl-3-butynyl,2-ethyl-3-
butynyl, and 1-ethyl-1-methyl-2-propynyl, preferably 2-
propynyl, 2-butynyl, 1-methyl-2-propynyl and 1-methyl-2-
butynyl, in particular 2-propynyl, where these alkenyl
and alkynyl groups may carry from one to five of the
halogen atoms stated above in general 'and in particular;
C3-C12-cycloalkyl, in particular C3-C6-cycloalkyl, such as
cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, which
is unsubstituted or substituted by one to three Ci-C~-
alkyl radicals;
phenyl which is unsubstituted or monosubstituted to tri-
substituted by C1-C,-alkyl or -alkoxy, such as methyl,
ethyl, propyl, butyl, methoxy, ethoxy, or phenyl which
is substituted by one to five halogen atoms, eg. chlorine
or fluorine;
a radical ON=CR°R', where
Re and R' are each straight-chain or branched C1-CZO-alkyl,
preferably C1-Cls-alkyl, in particular C1-C~-alkyl, which
may carry a phenyl, a C1-C,-alkoxy or a C1-C,-alkylthio
radical, or are each phenyl or together form C3-Cli-
alkylene, preferably C,-C~-alkylene,. which may carry from
one to three Cl-C3-alkyl groups, preferably methyl or
ethyl;,
R2 and R3 are each in general and in particular the alkyl
groups, haloalkyl groups, alkoxy groups, haloalkoxy
groups and/or alkylthio groups, each of 1 to 4 carbon
atoms', stated for R1;
X is oxygen or sulfur;
Y and Z are each nitrogen or a methine group =CH-;
R' is hydrogen; halogen as stated for R1, in particular
fluorine, chlorine or bromine;
cyano;
alkyl of one to four, in particular one to three, carbon
CA 02314121 2000-08-O1
- 14 -
atoms which is monosubstituted to pentasubstituted by
halogen, in particular fluorine or chlorine, for example
methyl, ethyl, n-propyl, isopropyl, trichloromethyl and
trifluoromethyl;
A is unsubstituted or substituted phenyl, where the sub-
stituents R° to R12 are the followings halogen, such as
fluorine, chlorine, bromine or iodine; cyano; nitro;
unsubstituted or halogen-substituted alkenyl, alkenyloxy,
alkynyloxy or alkynyl, each of 3 to 6.carbon atoms; di-
C1-C~-alkylamino, such as dimethylamino, diethylamino,
dipropylamino, di-1-methylethylamino, dibutylamino, di-
1-methylpropylamino, di-2-methylpropylamino, di-1,1-
dimethylethylamino, ethylmethylamS'no, propylmethylamino,
1-methylethylmethylamino or butylmethylamino; unsub-
stituted or alkyl-substituted cycloalkyl as stated above
for Rs, alkoxycarbonyl or alkylthio as stated above for
Rs, unsubstituted or substituted phenoxy as stated under
Rs, Cl-Coo-alkyl or alkoxy, in particular C1-C°-alkyl or
alkoxy, preferably C1-C,-alkyl or alkoxy, which are un-
substituted or substituted by the stated radicals: for
example, the following substituted phenyl radicals for A
may be mentioneds
2-fluorophenyl, 3-fluorophenyl, 4-fluorophenyl, 2,6
difluoropheny1,2,4-difluorophenyl,2-fluoro-4-trifluoro
methylphenyl, 2,3-difluorophenyl, 2-chlorophenyl, 3
chlorophenyl, 2-iodophenyl, 2-bromophenyl, 2-chloro-6-
fluorophenyl, pentafluorophenyl, pentachlorophenyl, 2,4-
dichlorophenyl, 2,6-dichlorophenyl, 2-chloro-4-fluoro-
phenyl, 3,5-dichlorophenyl, 2-chloro-6-methylphenyl,
2,3,5-trichlorophenyl, 2-methylphenyl, 3-methylphenyl, 4-
methylphenyl, 2,6-dimethylphenyl, 2,4-dimethylphenyl,
3,5-dimethylphenyl, 2,4,6-trimethylphenyl, 2-chloro-4-
methylphenyl, 2-methoxyphenyl, 4-methoxyphenyl, 4-chloro-
2-methoxyphenyl, 2-trifluoromethylphenyl, 2,3-dimethyl-
4-methoxyphenyl,4-dimethylamino-2-methylphenyl,3-cyano-
phenyl, 3-nitrophenyl, 3-phenoxyphenyl, 3-(3-trifluoro-
methylphenoxy)phenyl, 3-trifluoromethylphenyl,
CA 02314121 2000-08-O1
- 15 -
unsubstituted or substituted 5-membered hetaryl having 2
to 4 nitrogen atoms, as stated for R1, or one or two
nitrogen atoms and in addition a sulfur or oxygen atom,
such as isoxazolyl, oxazolyl, thiazolyl or thiadiazolyl.
Examples of hetaryl radicals are the followings
pyrazol-1-yl, 4-methylpyrazol-1-yl, 3,5-dimethylpyrazol-
1-yl, 3,4,5-trimethylpyrazol-1-yl, 4-chloropyrazol-1-yl,
4-phenylpyrazol-1-yl, 4-isopropylpyrazol-1-yl, 4-nitro-
pyrazol-1-yl, imidazol-1-yl, 4,5-dimethylimidazolyl, 2-
methyl-4,5-dichloroimidazolyl, 4'(5)-nitroimidazol-1-yl,
[1,2,4]-triazol-1-yl, 3(5)-methyl-[1,2,4]-triazol-1-yl,
[1,2,3]-triazol-1-yl, 4,5-dimethyl-[1,2,3]-triazol-1-yl,
' [1,2,3,4]-tetrazol-1-yl, 1-methylpyrazol-4-yl, 1-phenyl
pyrazol-4-y1, 1,3,5-trimethylpyrazol-4-yl,l-methyl
pyrazol-5-yl,l-phenylpyrazol-5-yl,l-methylpyrazol-3-yl,
1-phenylpyrazol-3-yl, 1-methylimidazol-2-yl, 1-methyl-
imidazol-5-yl, 1-phenylimidazol-5-yl, 1-phenyl-[1,2,3]-
triazol-4-yl, isoxazol-5-yl, isoxazol-4-yl, 3-methyl-
isoxazol-5-yl, 3-isopropyl-isoxazvl-5-yl, 3-phenyl-
isoxazol-5-yl, oxazol-2-yl, 2-methyloxazol-4-yl, thiazol-
4-yl, 2-benzthiazol-4-yl, 4-methylthiazol-2-yl, 4-methyl-
thiazol-5-y1,4-phenylthiazol-2-y1,2-phenylthiazol-5-yl.
Unsubstituted or substituted thienyl, pyridyl,
naphthyl, quinolyl, indazolyl or benzotriazolyl radicals
A are, for example, 2-thienyl, 3-thienyl, 2,3-dichloro
4-thienyl, 2-methyl-5-thienyl, 2-vitro-5-thienyl, 2
pyridyl, 3-pyridyl, 4-pyridyl, 6-methyl-2-pyridyl, 1
naphthyl, 2-naphthyl, quinol-2-yl, guinol-4-yl, quinol
8-yl, 7-chloroquinol-8-yl, 1-indazolyl and 1
benzotriazolyl.
Particularly preferred compounds of the formula
I are those in which R2 and R' are each methoxy, methyl,r
difluoromethoxy or chlorine, R~ is hydrogen or methyl,
is oxygen, Y is nitrogen, Z is a methane group and Rl and,'
A each have the meanings stated in the claim. ,
CA 02314121 2000-08-O1
' 16
Examples of salts of compounds of the formula I are environmentally
tolerated salts such as alkali metal salts, especially the potassium or
sodium salts, 'alkaline earth metal salts, especially the calcium, magnes-
ium or barium salts, manganese, copper, zinc or iron salts, and ammonium,
phosphonium, sulfonium or sulfoxonium salts, for example ammonium salts,
tetraalkylammonium salts, benzyltrialkylammonium salts, trialkylsulfonium
salts and trialkylsulfoxonium salts.
The herbicidal and growth-regulating agents I, or agents containing them,
may be applied for instance in the form of directly.sprayabl~ solutions,
powders, suspensions (including high-percentage aqueous, oily or other
suspensions), dispersions, emulsions, oil dispersions, pastes, dusts,
broadcasting agents, or granules by spraying, atomizing, dusting, broad-
casting or watering. The forms of application depend entirely on the pur-
pose for which the agents are being used, but they must ensure as fine a
distribution of the active ingredients according to the invention as
possible.
The compounds I are suitable for the preparation of solutions, emulsions,
pastes and oil dispersions to be sprayed direct. Examples of inert addit-
ives are mineral oil fractions of medium to high boiling point, such as
kerosene or diesel oil, further coal-tar oils, and oils of vegetable or
animal origin, aliphatic, cyclic and aromatic hydrocarbons such as
toluene, xylene, paraffin, tetrahydronaphthalene, alkylated naphthalenes
and their derivatives, methanol, ethanol, propanol, butanol, cyclohexanol,
cyclohexanone, chlorobenzene, isophorone, etc., and strongly polar
solvents such as N,N-dimethylformamide, dimethyl sulfoxide, N-methyl-
pyrrolidone, water, etc.
Aqueous formulations may be prepared from emulsion concentrates, pastes,
oil dispersions, wettable powders or water-dispersible granules by adding
water. To prepare emulsions, pastes and oil dispersions the ingredients as
such or dissolved in an oil or solvent may be homogenized in water by
means of wetting or dispersing agents, adherents or emulsifiers. Concen-
trates which are suitable for dilution with water may be prepared from
active ingredient, wetting agent, adherent, emulsifying or dispersing
agent and possibly solvent or oil.
Examples of surfactants are: alkali metal, alkaline earth metal and
ammonium salts of aromatic s~lfonic acids, e.g., ligninsulfonic acid,
phenolsulfonic acid, naphthalenesulfonic acid and dibutylnaphthalene-
sulfonic acid, and of fatty acids, alkyl and alkylaryl sulfonates, and
alkyl, lauryl ether and fatty alcohol sulfates, and salts of sulfated
hexadecanols, heptadeca~ols, and octadecanols, salts of fatty alcohol
glycol ethers, condensation products of sulfonated naphthalene and
naphthalene derivatives with formaldehyde, condensation products of
naphthalene or naphthalenesulfonic acids with phenol and formaidehyde,
CA 02314121 2000-08-O1
1~
polyoxyethylene octylphenol ethers, ethoxylated isooctylphenol, ethoxy-
lated octyiphenol and ethoxytated nonylphenoi, alkylphenol polyglycol
ethers, tributylphenyl polyglycol ethers, alkylaryl polyether alcohols,
isotridecyl alcohol, fatty alcohol ethylene oxide condensates, ethoxylated
castor oil, potyoxyethylene alkyl ethers, ethoxylated polyoxypropylene,
tauryl alcohol polyglycol ether acetal, sorbitol esters, lignin-sulfite
waste liquors and methyl cellulose.
Powders, dusts and broadcasting agents may be prepared by mixing or
grinding the active ingredients with a solid carrier.'
Granules, e.g., coated, impregnated or homogeneous granules, may be
prepared by bonding the active ingredients to solid carriers. Examples of
solid carriers are mineral earths such as silicic acids, silica gets,
silicates, talc, kaolin, attapulgus clay, limestone, lime, chalk, bole,
Loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium
sulfate, magnesium oxide, ground plastics, fertilizers such as ammonium
sulfate, ammonium phosphate, ammonium nitrate, and ureas, and vegetable
products such as grain meals, bark meal, wood meal, and nutshell meal,
cellulosic powders, etc.
The formulations contain from 0.1 to 95, and preferably 0.5 to 90, % by
weight of active ingredient. The active ingredients are employed in a
purity of 90 to 100, and preferably 95 to 100, % (according to the NMR
spectrum).
Examples of formulations are as follows:
I. 90 parts by weight of compound no. 1.004 is mixed with 10 parts by
weight of N-methyl-alpha-pyrrolidone. A mixture is obtained which is
suitable for application in the form of very fine drops.
II. 20 parts by weight of compound no. 1.005 is dissolved in a mixture
consisting of 80 parts by weight of xylene, 10 parts by weight of the
adduct of 8 to 10 moles of ethylene oxide and 1 mole of oleic acid-N-
monoethanolamide, 5 parts by weight of the calcium salt of dodecylbenzene-
sulfonic acid, and 5 parts by weight of the adduct of 40 moles of ethylene
oxide and 1 mole of castor oil. By pouring the solution into 100,000 parts
by weight of water and uniformly distributing it therein, an aqueous dis-
pension is obtained containing 0.02% by weight of the active ingredient.
III. 20 parts by weight of compound no. 1.024 is dissolved in a mixture
consisting of 40 parts by weight of cyclohexanone, 30 parts by weight of
isobutanol, 20 parts by weight of the adduct of 7 moles of ethylene oxide
and 1 mole of isooctylphenol, and 10 parts by weight of the adduct of
CA 02314121 2000-08-O1
18
40 moles of ethylene oxide and 1 mole of castor oil. By pouring the
solution into 100,000 parts by weight of water and finely distributing it
therein, an aqueous dispersion is obtained containing 0.02% by weight of
the active ingredient.
IV. 20 parts by weight of compound no. 1.063 is dissolved in a mixture
consisting of 25 parts by weight of cyclohexanone, 65 parts by weight of a
mineral oil fraction having a boiling point between 210 and 280°C, and
parts by weight of the adduct of 40 moles of ethylene oxide and 1 mole
10 of castor oil. ey pouring the solution into 100,000.~arts by:weight of
water and uniformly distributing it therein, an aqueous dispersion is
obtained containing 0.02% by weight of the active ingredient.
V. 20 parts by weight of compound no. 2.003 is:well mixed with 3 parts by
weight of the sodium salt of diisobutylnaphthalene-alpha-sulfonic acid,
17 parts by weight of the sodium salt of a lignin-sulfonic acid obtained
from a sulfite waste liquor, and 60 parts by weight of powdered silica
gei, and triturated in a hammer mill. 8y uniformly distributing the
mixture in 20,000 parts by weight of water, a spray liquor is obtained
containing 0.1% by weight of the active ingredient.
VI. 3 parts by weight of compound no. 2.004 is Intimately mixed with
97 parts by weight of particulate kaolin. A dust is obtained containing 3%
by weight of the active ingredient.
VII. 30 parts by weight of compound no. 1.004 is intimately mixed with a
mixture consisting of 92 parts by weight of powdered silica gel and
8 parts by weight of paraffin oil which has been sprayed onto the surface
of this silica gel. A formulation of the active ingredient is obtained
having good adherence.
VIII. 20 parts by weight of compound no. 1.024 is intimately mixed with
2 parts of the calcium salt of dodecylbenzenesulfonic acid, 8 parts of a
fatty alcohol polyglycol ether, 2 parts of the sodium salt of a phenol-
sulfonic acid-urea-formaldehyde condensate and 68 parts of a paraffinic
mineral oil. A stable oily dispersion is obtained.
The active ingredients or the herbicidal agents containing them may be
applied pre- or postemergence. If certain crop plants tolerate the active
ingredients less well, application techniques may be used in which the
herbicidal agents are sprayed from suitable equipment in such a manner
that the leaves of sensitive crop plants are if possible not touched, and
the agents reach the soil or the unwanted plants growing beneath the crop
plants (post-directed, lay-by treatment).
CA 02314121 2000-08-O1
19
The application rates depend on the objective to be achieved, the time of
the year, the plants to be combated and their growth stage, and are from
0.001 to 3.0, preferably 0.005 to 0.5, kg of active ingredient per
hectare.
the growth-regulating salicylic acid derivatives of the formula I may
exercise a variety of influences on practically all plant development
stages, and are therefore used as growth regulators. The diversity of
action of growth regulators depends especially on
'
a) the type and variety of plant;
b) the time applied, with reference to the development stage of the
plants and the time of the year;
c) the place and method of application (seed treatment, soil treatment,
or application to foliage);
d) climatic factors, e.g., average temperature, amount of precipitation,
sunshine and duration;
e) soil conditions (including fertilization);
f) the formulation of the active ingredient; and
g) the concentration at which the active ingredient is applied.
A description of some of the various possibilities of using the growth
regulators according to the invention in agriculture and horticulture is
given below.
30
A. Vegetative plant growth can be inhibited to a considerable extent, a
fact which is manifested particularly in a reduction in plant height.
The treated plants thus have a compact habit; furthermore, the leaf
color is darker.
Of advantage in practice is for example the reduction in grass growth
on roadsides, hedges, canal embankments and on areas such as parks,
sportsgrounds, fruit orchards, lawns and airfields, thus reducing
expensive and time-consuming mowing.
A further feature of economic interest is the increase in the rigor of
crops which tend to lodge, such as cereals, Indian corn, sunflowers
and soybeans. The shortening and strengthening of the stem thus caused
reduces or eliminates the danger of lodging under unfavorable weather
conditions.
,t CA 02314121 2000-08-O1
The use of growth regulators is also important for inhibiting plant
height and changing the time of ripening in cotton. It is thus pos-
sible for~this important crop to be harvested completely mechanically.
5 In fruit and other trees, pruning costs can be reduced with growth
regulators. With growth regulators, it is also possible to break up
the alternate breeding rhythm of fruit trees.
Growth regulators may also increase or inhibit lateral branching. This
10 is of interest when, for instance in tobacco plants, it 'is desired to
inhibit the formation of lateral shoots (suckers) in favor of leaf
development.
With growth regulators, it is possible for instance in winter rape to
15 considerably increase the resistance to freeze injury. On the one
hand, upward growth and the development of a too luxuriant (and thus
particularly frost-susceptible) leaf or plant mass are inhibited; on
the other, the young rape plants are kept, in spite of favorable
growth conditions, in the vegetative development stage before winter
20 frosts begin. The danger of freeze injury is thus eliminated in plants
which tend to lose prematurely their inhibition to bloom and pass into
the generative phase. In other crops, too, e.g., winter cereals, it is
advantageous if the plants are well tillered in the fall as a result
of treatment with the compounds according to the Invention, but enter
winter with not too lush a growth. This is a preventive measure
against increased susceptibility to freeze injury and - because of the
relatively low leaf or plant mass - attack by various (especially
fungus) diseases. The inhibition of vegetative growth also makes
closer planting possible in numerous crops, which means an increase in
yield, based on the area cropped.
B.
Better yields both of plant parts and plant materials may be obtained
with the novel agents. It is thus for instance possible to induce
increased formation of buds, blossom, leaves, fruit, seed grains,
roots and tubers, to increase the sugar content of sugarbeets,
sugarcane and citrus fruit, to raise the protein content of cereals
and soybeans, and to stimulate the increased formation of latex in
rubber trees.
The salicylic acid derivatives of the formula I may raise the yield by
influencing plant metabolism or by promoting or inhabiting vegetative
and/or generative plant growth.
CA 02314121 2000-08-O1
21
C. It is also possible with growth regulators to shorten or lengthen
growth stages and to accelerate or retard the ripening process in
plant parts either before or after harvesting.
A factor of economic interest is for example the facilitation of har-
vesting made possible by a chemical, temporally concentrated loosening
(abscission) of the adherence of stalks to the branches of citrus
fruit, olive trees, and other kinds of pomes, drupes and indehiscent
fruit. The same mechanism, i.e., promotion of the formation of separ-
ation layers between fruit or leaf and stem of the plant', is also es-
sential for a readily controllable defoliation of crop plants, e.g.,
cotton.
D. Further, transpiration in crop plants may be reduced with growth
regulators. This is particularly important for plants growing in
agricultural areas which are expensive to irrigate, e.g., in arid or
semi-arid areas. Irrigation frequency can be reduced by using the
compounds according to the invention, making for lower costs. As a
result of the use of growth regulators, the water available can be
better utilized, because, inter alia,
- the size of the stomata opening is reduced;
- a thicker epidermis and cuticle are formed;
- penetration of the soil by the roots is improved;
- the micro-climate in the stand is favorably influenced by the
more compact growth.
the active ingredients according to the invention may be applied not only
to the seed (as a dressing), but also to the soil, i.e., via the roots,
and to the foliage by spraying.
As a result of the good tolerance by crop plants, the application rate
when the active ingredients are used as growth regulators may vary within
wide limits.
When the active ingredients are used for treating seed, amounts of from
0.001 to 50, and preferably from 0.01 to 10, g per kg of seed are general-
ly required. For foliage and soil treatment, amounts of from 0.001 to 10,
preferably from 0.01 to 3, and especially from 0.01 to 0.5, kg/ha are
generally considered to be sufficient.
the active ingredients or the herbicidal agents containing them may be
applied pre- or postemergence. If certain crop plants tolerate the active
ingredients less well, application techniques may be used in which the
herbicidal agents are sprayed from suitable equipment in such a manner
CA 02314121 2000-08-O1
22
that the Leaves of sensitive crop plants~are~ff possible not touched, and
the agents reach the soil or the unwanted plants growing beneath the crop
plants (post-directed, lay-by treatment).
The application rates depend on the objective to be achieved, the time of
the year, the plants to be combated and their growth stage, and are from
0.001 to 3.0, preferably 0.01 to 1.0, kg of active ingredient per hectare.
In view of the numerous application methods possible, the compounds
according to the invention, or agents containing them, may be used in a
large number of crops. Those which follow are given by way of example:
Botanical name Common name
Allium cepa , onions
15Ananas comosus pineapples
Arachis hypogaea peanuts (groundnuts)
Asparagus officinalis asparagus
Avena sativa oats
Beta vulgaris spp. altissima sugarbeets
20Beta vulgaris spp. rape fodder beets
Beta vulgaris spp. esculenta table beets, red beets
Brassica napus var. napus rapeseed
Brassica napus var. napobrassica Swedes
Brassica napus var. rapa turnips
25Brassica rapa var. silvestris
Camellia sinensis tea plants
Carthamus tinctorius safflower
Carya illinoinensis pecan trees
Citrus limon lemons
30Citrus maxima grapefruits
Citrus reticulate mandarins
Citrus sinensis orange trees
Coffee arabica (Coffee canephora,
Coffee liberica) coffee plants
35Cucumis melo ~ melons
Cucumis sativus cucumbers
Cynodon dactylon Bermudagrass
Daucus carota carrots
Elais guineensis oil palms
40Fragaria vesca strawberries
Glycine max soybeans
Gossypium hirsutum (Gossypium arboreum,.
Gossypium herbaceum, Gossypium vitifolium)cotton
Helianthus annuus ~ sunflowers
Helianthus tuberosus Jerusalem artichoke
Hevea brasitiensis rubber plants
" CA 02314121 2000-08-O1
23
Botanical name Common name
Hordeum vulgare barley
Humulus lupulus hops
Ipomoea batatas sweet potatoes
~uglans regia ~ walnut trees
Lactuca sativa lettuce
Lens culinaris lentils
Linum usitatissimum flax
Lycopersicon lycopersicum tomatoes
10Malus spp. . appl-e trees.
Manihot esculenta cassava
Medicago saliva alfalfa (lucerne)
Mentha piperita peppermint
Muss spp. . banana plants
15Nicotiana tabacum (N. rustics) tobacco
Olea europaea olive trees
Oryza sativa rice
Panicum miliaceum millet --
Phaseolus lunatus limabeans
20Phaseolus mungo mungbeans
Phaseolus vulgaris snapbeans, green beans,
dry beans
Pennisetum glaucum pearl millet
Petroselinum crispum spp. tuberosumparsley
25 Picea abies Norway spruce
Abies albs fir trees
Pinus spp. pine trees
Pisum sativum English peas
Prunus avium cherry trees
30 Prunus domestics plum trees
Prunus dutcls almond trees
Prunus persica peach trees
Pyrus communis pear trees
RibeS sylvestre redcurrants
35 Ribes uva-crisps ~ gooseberries
Ricinus communis castor-oil plants
Saccharum officinarum sugar cane
Secale cereals rye
Sesamum indicum sesame
40 Solanum tuberosum Irish potatoes
Sorghum bicolor (s. vulgare) sorghum
Sorghum dochna sorgo
Spinacia oleracea spinach
Theobroma cacao - cacao plants
CA 02314121 2000-08-O1
24
Botanical name Common name
Trifolium pretense red clover
Triticum aestivum wheat
Triticum durum durum wheat
Vaccinium corymbosum blueberries
vaccinium vitas-idaea cranberries
vitae faba tick beans
vigna sinensis (v. unguiculata) cow peas
vitas vinifera grapes
Zea mays . Indian corn; sweet corn,
maize
To increase the spectrum of action and to achieve synergistic effects, the
compounds of the formula I according to the invention may be mixed with
each other, or mixed and applied together with numerous representatives of
other herbicidal or growth-regulating active ingredient groups. Examples
of suitable components are diazines, 4H-3,1-benzoxazine derivatives, ben-
zothiadiazinones, 2,6-dinitroanilines, N-phenylcarbamates, thiolcarbam-
ates, halocarboxylic acids, triazines, amides, ureas, Biphenyl ethers,
triazinones, uracils, benzofuran derivatives, quinolinecarboxylic acids,
(hetero)-aryloxyphenoxypropionic acid derivatives (salts, esters, amides),
etc.
It may also be useful to apply the compounds of the formula I, either a
lone or in combination with other herbicides, in admixture with other crop
protection agents, e.g., agents for combating pests or phytopathogenic
fungi or bacteria. The compounds may also be mixed with solutions of
mineral salts used to remedy nutritional or trace element deficiencies.
Non-phytotoxic oils and oil concentrates may also be added.
35
CA 02314121 2000-08-O1
- 25 - ._
Synthesis Examples
The methods described. in the Synthesis Examples
below were used, with appropriate modification of the
starting compounds, to obtain further compounds I. The
compounds thus obtained are listed in the Tables below,
together with physical data. Compounds without this data
can be synthesized similarly from the corresponding
starting compounds. The structures shown in the Table
describe particularly preferred active.ingredients of the
formula I.
EXAMPLE 1
Methyl 3-(4,6-dimethoxypyrimidin-2-yl)-oxybiphenyl-2-
carboxylate (compound No. 1005):
a) Methyl 6-phenylsalicylate:
Variant 1
58 g (0.5 mol) of methyl acetoacetate are added
to a solution of 0.5 g of sodium hydride in 100 ml of dry
ethanol, 66 g (0.5 mol) of cinnamaldehyde are rapidly
added dropwise and the mixture is stirred for about 10 h
at room temperature. The mixture is then saturated at
0°C with dry HC1 gas and then stirred for a further 1 day
at room temperature (20°C). The solvent is removed and
the remaining residue is distilled under reduced pres-
sure, HCl gas initially being liberated. Fractions pass-
25. ing over from 115 to 165°C/0.2 mbar are combined and are
chromatographed over silica gel (elution, with toluene/-
cyclohexane). 33:7 g of a yellow oil are obtained as an
intermediate. This is dissolved in 150 ml of methylene
chloride, and a solution of 22.9 g (0.14 mol) of bromine
in 150 ml of glacial acetic acid is added rapidly at 0°C,
and the mixture is slowly heated up and is refluxed for
one hour. The reaction solution is poured into 200 ml of
methylene chloride and 500 ml of water. The organic
phase is separated off and worked up in a conventional
manner. A yellow solid is obtained as an intermediate,
which is dissolved in 400 ml of methyl tert-butyl ether
for further processing. 55 g (0.56 mol) of triethylamine
CA 02314121 2000-08-O1
- 26 -
are added and the mixture is ref luxed for 5 h . There
after, 300 ml of water are added, and the organic phase
is separated off and worked up in a conventional manner.
The residue is distilled at 100-114°C/0.2 mbar. Yield:
11.9 g.
Variant 2
8.55 g (0.3 mol) of 85% sodium hydride are added
a little at a time to a solution of 57 g (0.15 mol) of
methyl 4-(triphenylphosphoranylidene)-acetoacetate in
700 ml of tetrahydrofuran under a:nitrogen atmosphere and
the mixture is then heated to about 35°C. At this tem-
perature, 20 g (0.15 mol) of cinnamaldehyde are added a
little at a time, followed by 5-10 drops of water, and
the initially exothermic reaction.requires cooling. The
reaction is continued at 35°C until the ylide has been
completely converted (TLC check, about 12-14 h). The
reaction mixture is then rendered acidic with 10%
strength hydrochloric acid and, after the addition of 1 1
of water, is extracted with four times 150 ml of ether.
The combined ether phases are extracted by shaking in
200 ml of water and 200 ml of saturated sodium chloride
solution, dried over sodium sulfate and evaporated down.
The remaining blackish brown residue is taken up in 400
ml of methyl tent-butyl ether and boiled for several
hours. After cooling, it is filtered off from the
insoluble residue (triphenylphosphine oxide), and the
filtrate is evaporated down. The remaining oil is
purified by chromatography over silica gel (mobile phases
toluene/ethyl acetate with gradually increasing ethyl
acetate content). All fractions before the triphenyl-
phosphine oxide are combined and are brominated, aro-
matized and worked up similarly to the above method.
14.5 g of product are obtained.
b) Methyl 3-(4,6-dimethoxypyrimidin-2-yl)-oxybiphenyl-
2-carboxylates
11.4 g (0.05 mol) of methyl 3-hydroxybiphenyl-2-
carboxylate in 50 ml of dry dimethylformamide are
CA 02314121 2000-08-O1
- 2T - j
initially taken, and 1.5 g (0.05 mol) of 80% strength
sodium hydride are added a little at a time at from 0 to
5°C, while stirring. 10.9 g (0.05 mol) of 4,6-dimethoxy-
2-methylsulfonylpyrimidine are then added at room tem-
perature, the mixture is heated to 90°C and stirring is
continued at this temperature for 6 h. The solution thus
obtained is poured into water. The mixture is extracted
with methylene chloride and the extract is washed with
water, dried over sodium sulfate and, evaporated down.
The crude product can be further purified by column
chromatography using toluene/ethyl acetate, with the
result that 9.6 g of a solid of melting point 98-102°C is
obtained.
For example, the following compounds can also be
prepared similarly to a) or b)s
Methyl 6-(3,5-dichlorophenyl)-salicylate, 1H-NMR (CDCl3s
a - 3.58 (s; 3H); 6.70 (d; 1H); 7.05 (d; 1H); 7.10 (d;
2H); 7.25-7.40 (m; 2H); 10.85 (s; 1H).
Methyl 6-(2,4-dichlorophenyl)-salicylate, 1H-NMR (CDCl3s
a = 3.58 (s; 3H); 6.65 (d; 1H); 7.0-7.5 (m; 5H); li.i (s;
1H).
Methyl 2-(4,6-dimethoxypyrimidin-2-yl)-oxy-6-(3,5-
dichlorophenyl)-benzoate (compound No. 1063), mp. 133-
137°C.
Methyl 2-(4,6-dimethoxypyrimidin-2-yl)-oxy-6-(2,4-
dichlorophenyl)-benzoate (compound No. 1024), mp. 99-
100°C.
EXAMPLE 2
General method for the preparation of the salicylic acid
derivatives of the formula Is
0.073 mol of the particular aromatic 2-hydroxy-
carboxylic acid is dissolved in 320 ml of dry dimethyl
sulfoxide, and 16.4 g (0.146 mol) of potassium tert-
butylate are added a little at a time, the temperature of
the reaction mixture increasing to about 30°C. The mix-
ture is cooled to room temperature, 16.0 q (0.073 mot) of
4,6-dimethoxy-2-methylsulfonylpyrimidine are added and
_. CA 02314121 2000-08-O1
- 28 -
stirring is continued for about 1 h at room temperature.
The reaction mixture is poured into about 2 1 of cold
water, acidified with hydrochloric acid and extracted
with methyl test-butyl ether. After the usual working
up, the remaining crude product can, if required, be
purified by stirring with a suitable solvent or by
chromatography over silica gel.
EXAMPLE 3
General method for the preparation of the salicylic acid
derivatives of the formula Is
5.1 g of potassium hydroxide and 0.08 mol of the
particular 2-hydroxycarboxylic acid aredissolved in 80 ml
of methanol, and the solution is stirred at room tempera-
ture for 10 minutes and evaporated down under reduced
pressure. Thereafter, toluene is added repeatedly to
effect drying and is evaporated at 50°C-sunder reduced
pressure. The pale red powder thus obtained is taken up
in 300 ml of dimethyl sulfoxide, and 2.9 g of 80% streng-
th sodium hydride are added a little at a time at room
temperature, gas evolution occurring. When gas is no
longer evolved, a solution of 17.4 g of 4,6-dimethoxy-2-
methylsulfonylpyrimidine (or an equivalent amount of the
particular pyridine, pyrimidine or triazine derivative
used) in 80 ml of dimethyl sulfoxide is added dropwise
and stirring is continued for 0.5~ h. The mixture is
poured into 2 1 of water, neutralized with acetic acid
and washed with methylene chloride. It is then rendered
strongly acidic with hydrochloric acid and extracted
several times with methyl test-butyl ether. The organic
phase is dried over sodium sulfate and the solvent is
evaporated under reduced pressure. The remaining sub-
stance can be purified by chromatography over silica gel.
EXAMPLE 4
General method for the preparation of aromatic carboxylic
oxime esters or similar compounds of the formula I:
3.2 mmol of the particular aromatic 2-(4,6-
dimethoxypyrimidin-2-yl)-oxycarboxylic acid in 20 ml of
CA 02314121 2000-08-O1
- 29 -
dimethoxyethane are initially taken and 3.2 mmol of
sodium hydride are added, gas evolution occurring immedi-
ately. The mixture is stirred for 1 h at room tempera-
ture and pooled to 0°C, and 3.5 mmol of oxalyl chloride
are added. Stirring is continued for 1 h at 0°C, after
which about 30% of the solvent are evaporated under
reduced pressure in order to remove the excess oxalyl
chloride. 4.2 mmol of the particular oxime or of a com-
parable hydroxy compound dissolved in ~0 ml of dimethoxy-
ethane and then 3.2 mmol of pyridine are added at 0°C,
and the mixture is warmed to room temperature in the
course of 1 h. The mixture is poured into 120 ml of cold
water and extracted with methylene~chloride. The organic
phase is dried over sodium sulfate and evaporated down
under reduced pressure. The remaining substance can be
further purified by chromatography over silica gel.
EXAMPLE 5
Ethyl 2-(4,6-dimethoxypyrimidin-2-yl)-oxy-6-(pyrazol-1-
yl)-benzoate (compound No. 2004):
a) 2-Methoxy-6-(pyrazol-1-yl)-benzonitrilea
A solution of 0.273 mol of sodium pyrazolide
(prepared from equimolar amounts of pyrazole and sodium
hydride) in 140 ml of N,N-dimethylethyleneurea is added
dropwise at 50°C, under nitrogen, to a solution of 41.2 g
(0.273 mol) of 2-methoxy-6-fluorobenzonitrile (prepara-
tion: J. Heterocycl. Chem. 2~ (1988), 1173) in 50 ml of
N,N-dimethylethyleneurea and the mixture is stirred at
60°C for 2h. After the mixture has been cooled and
stirred into 4 1 of ice water and the precipitated
crystals have been filtered off~under suction and dried,
37.1 g of the product of melting point 93-94°C are
obtained.
b) 0-ethylimino 2-methoxy-6-(pyrazol-1-yl)-benzoates
37.1 g (0.186 mol) of 2-methoxy-6-(pyrazol-1-yl)-
benzonitrile are introduced at 0°C, while stirring, into
68.0 g of a 38% strength solution of dry HCl gas in
ethanol in the absence of moisture. After dilution with
CA 02314121 2000-08-O1
- 30 -
20 ml of ethanol, the mixture is stirred for 48 h at room
temperature, poured into 500 mI of ice water and brought
to a pH of 7 by the addition of 2 N sodium hydroxide
solution followed by saturated sodium bicarbonate solu-
tion.. After the precipitated crystals have been filtered
off under suction and dried, 30.3 g of the product of
melting point 72-73°C are obtained.
c) Ethyl 2-methoxy-6-(pyrazol-1-yl)-benzoatea
29.0 g (0.118 mol) of O-ethylimino 2-methoxy-6
(pyrazol-1-yl)-benzoate and 300 ~ml of~ hydrochloric acid
are stirred for 16 h at 50°C. After cooling, the reaction
mixture is extracted with three times 100 ml of methylene
chloride. The extract is evaporated down to give 16.7 g
of residue, which is chromatographed over silica gel
using 9 : 1 toluene/ethyl acetate. 13.4 g of the product
of melting point 159-163°C are obtained.
d) Ethyl 6-(pyrazol-1-yl)-salicylates
200 ml (0.2 mol) of 1 molar boron tribromide
solution are added dropwise to a solution of 15.3 g
(0.062 mol) of ethyl 2-methoxy-6-(pyrazol-1-yl)-benzoate
in 140 ml of methylene chloride at from 20 to 25°C. Stir-
ring is carried out for about 10 h at room temperature,
after which 160 ml of ethanol are added dropwise at 0°C.
Stirring is continued for 15 minutes, after Which the
solvent is substantially removed at 30°C under reduced
pressure and the residue is stirred with 200 ml of water.
The residue is extracted with three times 70 ml of di-
ethyl ether, the extract is evaporated down and the crude
product is chromatographed over silica gel using tolu-
ene/ethyl acetate. 8.7 g of product are obtained as an ,
oil. 1H-NMR (selected signals): a = 0.98 (t); 4.10 (q);
6.38; 6.90; 7.10; 7.45 (t); 7.60; 7.70; 10.70 (s).
From these compounds, it is possible to obtain 6
(pyrazol-1-yl)-salicylic acid by hydrolysis with dilute
sodium hydroxide solution (melting points 175-179°C).
e) Methyl 2-(4,6-dim~thoxypyrimidin-2-yl)-oxy-6-
(pyrazol-1-yl)-benzoate:
CA 02314121 2000-08-O1
- 31 -
0.46 g (0.015 mol) of 80% strength sodium hydride
is added at 10°C to 3 . 48 ~ g ~( 0 . 015 mol ) of ethyl 6-
(pyrazol-1-yl)-salicylate dissolved in 25 ml of dry di-
methylformamide, and the mixture is stirred at 30°C for
3 h. Thereafter, 3.27 g (0.015 mol) of 2-methylsulfonyl-
4,6-dimethoxypyrimidine are added and stirring is con-
tinued for about 12 h at room temperature. The reaction
mixture is added to 500 ml of water to which 2.5 m1 of
orthophosphoric acid were added beforehand. The oil
which separates out is taken up in ethyl acetate and
dried over sodium sulfate. Evaporation gives 4.0 g of a
crystalline crude product, which is further purified by
recrystallizativn from diethyl ether/methyl tert-butyl
ether. Melting point 94-96°C.
EXAMPLE 6
2-(4,6-Dimethoxypyrimidin-2-yl)-oxy-6-(1,2,4-triazol-1-
yl)-benzoic acid (compound No. 2035)
a) 2-Methoxy-6-(1,2,4-triazol-1-yl)-benzonitriles
A solution of 30.2 g (0.20 mol) of 2-methoxy-6
fluorobenzonitrile [preparations J. Heterocycl. Chem. 2,~
(1988), 1173] in 50 ml of N,N-dimethylformamide is added
dropwise at 45-50°C, under nitrogen, to a solution of
0.21 mol of sodium triazolide (prepared from equimolar
amounts of triazol and sodium hydride) in 100 ml of N,N
dimethylformamide, and the mixture is stirred for 2 h at
50°C. After the solvent has been evaporated under reduced
pressure, the residue is stirred with 200 ml of ice
water, the pH is brought to 6 with a little glacial
acetic acid and the solid is filtered off under suction
and dried. After the addition of a little ether, 35 g of
the product of melting point 169-171°C (decomposition)
are obtained.
b) 2-Methoxy-6-(1,2,4-triazol-1-yl)-benzamides
15.0 g (0.075 mol) of 2-methoxy-6-(1,2,4-triazol
1-yl)-benzonitrile are suspended in 300 ml of water, 9.6
(0.015 mol) of 40% strength.tetrabutylammonium hydroxide
solution are added and the mixture is refluxed for 4 h
,, CA 02314121 2000-08-O1
- 32 -
and evaporated down under reduced pressure. The crude
product is further hydrolyzed without additional purifi
cation (see C). A sample of the above product isolated
from this crude product has a melting point of 140-150°C
(decomposition).
c) 2-Methoxy-6-(1,2,4-triazol-1-yl)-benzoic acids
0.116 mol of the above crude 2-methoxy-6-(1,2,4-
triazol-1-yl)-benzamide are stirred in a mixture of
120 ml of concentrated hydrochloric acid and 60 ml of
glacial acetic acid for 5 h at"100°C. The mixture is
evaporated down under reduced pressure and the process is
repeated with the residue. After further evaporation of
the mixture, the residue is disso,~.ved in a little water
and the solution is brought to pH 3 with sodium hydroxide
. solution. 30-40 ml of ethanol are added, after which the
precipitate is filtered off under suction and dissolved
in methanol. After the solution has been dried and
evaporated down, 14.7 g of the above acid of melting
point 200-202°C (decomposition) are isolated.
d) 6-(1,2,4-triazol-1-yl)-salicylic acids
9.2 g (0.042 mol} of 2-methoxy-6-(1,2,4-triazol-
1-yl)-benzoic acid and 50 ml of hydrobromic acid (47%
strength) are stirred for 5 h at 100°C. After the mineral
acid has been evaporated under reduced pressure, the
residue is stirred with ethanol and. the mixture is again
evaporated down under reduced pressure. After the
residue has been made into a paste with about 20 ml of
water, the pH has been brought to 3.5 with sodium hydrox-
ide solution and the solid has been filtered off under
suction and dried, 4.6 g of the crude product are
obtained; after this crude product has been boiled with
ml of ethyl acetate and cooled and the solid has been
filtered off under suction, 3.5 g of the above salicylic
acid of melting point 214-215°C (decomposition) are
35 obtained.
CA 02314121 2000-08-O1
- 33 -
e) 2-(4,6-Dimethoxypyrimidin-2-yl)-oxy-6-(1,2,4-
triazol-1-yl)-benzoic acids
2.24 g {0.02 mol) of potassium tart-butylate are
added~~a little at a time to 2.05 g (0.01 mol) of 6
(1,2,4-triazol-1-yl)-salicylic acid in 30 ml of dry di
methyl sulfoxide, and the mixture is stirred for 1 h at
40°C. Thereafter, 2.18 g (0.01 mol) of 2-methylsulfonyl-
4,6-dimethoxypyrimidine are added at room temperature and
stirring is continued for about 20 h at room temperature.
The reaction mixture is poured into 450 ml of ice water
to which 1 ml of orthophosphoric acid has been added
beforehand. After the precipitate has been filtered off
under suction, washed with cold water and dried, 2.85 g
of the above product of melting point 158-160°C are
obtained.
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62 , ___
Examples demonstrating herbicidal action
The herbicidal~actian of the salicylic acid derivatives of the formula I
is demonstrated in greenhouse experiments.
The vessels employed were plastic flowerpots having a volume of 300 cm3
and filled with a sandy loam containing about 3.0% humus. The seeds of the
test plants were sown separately, according to species.
For the preemergence treatment, the formulated.. active ingredients were
applied to the surface of the soil immediately after the seeds had been
sown. The compounds were emulsified or suspended in water as vehicle, and
sprayed through finely distributing nozzles. After the agents had been
applied, the vessels were lightly sprinkler-irrigated to induce germin-
ation and growth. Transparent plastic covers were then placed on the
vessels until the plants had taken root. The cover ensured uniform germin-
ation of the plants, insofar as this was not impaired by the active
ingredients.
For the postemergence treatment, the plants were grown, depending on
growth form, to a height of 3 to 15 cm before being treated with the com-
pounds, suspended or emulsified in water. The plants were either sown and
grown in the same vessels, or they were grown separately as seedlings and
transplanted to the test vessels a few days before treatment. The appli-
cation rate for postemergence treatment was 0.5 kg/ha.
The pots were set up in the greenhouse, heat-loving species at 20 to
35°C,
and species from moderate climates at 10 to 25°C. The experiments were
run
for from 2 to 4 weeks. During this period the plants were tended and their
reactions to the various treatments assessed. The assessment scale was 0
to 100, 100 denoting nonemergence or complete destruction of at least the
visible plant parts, and 0 denoting no damage or normal growth.
The plants employed for the experiments were Bromus inermis, Echinochloa
crus-galli and Ipomoea spp. '
Compound 1.004, applied postemergence at a rate of 0.5 kg/ha, provided
excellent control of unwanted plants.
