GB2055092A

GB2055092A - Novel thioamide pesticides, preparation and use

Info

Publication number: GB2055092A
Application number: GB8016331A
Authority: GB
Original assignee: Wellcome Foundation Ltd
Current assignee: Wellcome Foundation Ltd
Priority date: 1979-05-17
Filing date: 1980-05-16
Publication date: 1981-02-25
Also published as: ZM4980A1; JPS55153762A; MW2080A1; ZA802925B

Abstract

Compounds of formula (I) are pesticides active against arthropods. <IMAGE> wherein R<1>, R<2>, and R<3> are H, alkyl, alkoxy, halo, CN or CF3 or two are linked to form a 3 or 4 carbon atom group; X is O or NA where A is H or alkyl; R is H or alkyl; R<4> is H or optionally substituted alkyl, aryl, aralkyl, alkenyl or alkynyl; and R<5> is -CB. R<6> where B is O, S or NR<7> where R<7> is H, CN, alkyl, alkoxy, or optionally substituted aryl or aralkyl; R<6> is H, R<8>, OR<8>, SR<8> or NR<9> R<10> where R<8> is alkyl, alkenyl or optionally substituted aryl, aralkyl or aryloxyalkyl; and R<9> and R<10> are H, alkyl or optionally substituted aryl or aralkyl. The invention also comprises processes for the preparation of compounds (I), formulations containing them, and their use as pesticides.

Description

SPECIFICATION Novel pesticides, preparation and use This invention relates to novel amides, processes for their preparation, intermediates useful in those processes, pesticidal formulations containing the amides, and their use as pesticides.

Compounds of formula (I) below have activity against Arthropods, in particular against members of the Order Acarina.

In formula (I), R', R2 and R3 are the same or different and are selected from hydrogen, alkyl, alkoxy, halo, cyano and trifluoromethyl or two of R', R2 and R3 are linked to form a 3 or 4 carbon atom group; X is O or NA where A is hydrogen or alkyl; R is hydrogen or alkyl; R4 is hydrogen; alkyl; substituted alkyl wherein the substituent(s) are selected from halo, hydroxy, cyano, alkoxy, aryloxy, alkylthio, arylthio and substituted amino; alkynyl; alkenyl; haloalkenyl; aralkyl; aryl; or a substituted aryl or aralkyl group where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl; and R5 is a group

where B is 0, S or NR7 where R7 is hydrogen, CN, alkoxy, alkyl, aralkyl, aryl or a substituted aryl or aralkyl group where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl; and R6 is hydrogen or a group R8, OR8, SR8 or NR9R10 where R8 is alkyl, aryloxyalkyl, alkenyl, aralkyl, aryl or a substituted aryl, aralkyl or aryloxyalkyl group where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl, and R9 and R'O are the same or different and are selected from hydrogen, alkyl, aralkyl, aryl or substituted aryl or aralkyl where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl.

Certain compounds of formula (I) where X is NA or B is NR7 and intermediates as hereinafter defined are able to form acid addition salts, and references to such compounds include references to acid addition salts unless the context clearly indicates otherwise.

Wherein used herein, 'alkyl' and 'alkoxy' mean a straight or branched alkyl or alkoxy group, respectively, having from 1 to 20 such as 1 to 5 carbon atoms, such as methyl and methoxy; 'halo' means fluoro, chloro, bromo or iodo; 'alkenyl' means an alkenyl group having from 2 to 20 carbon atoms, and having one or more double bonds, such as prop-2-enyl; 'aryl' means phenyl or naphthyl; and 'arakyl' means alkyl substituted by an aryl group, such as benzyl. When R4 is alkenyl, it is an alkenyl group which is saturated in the 1-position.

One preferred sub-group or compounds of formula (I) are those of formula (ill):

wherein R1, R2, R3, R and X are as defined above and Y is alkyl, alkenyl aryl or aralkyl.

Preferred compounds of formulae (I) and (II) are those having one or more of the following features: X is O or NH; R is hydrogen or methyl; R' is in the 2-position and R2 is in the 3-position, particularly those where R3 is hydrogen and at least one of R' and R2 is halo or alkyl; R4 is hydrogen; Y is alkyl, aryl or aralkyl, such as ethyl, phenyl, or benzyl; B is S; and R6 is optionally substituted phenylamino.

The compounds of formula (I) may be made by any method known for making compounds having analogous functional groups. These methods include: (a) the reaction of a compound of formula (III):

wherein R', R2, R3, X and R are as defined in formula (i) and Z is a leaving group such as alkoxy, alkylthio, aralkoxy, aralkylthio or mercapto with a compound of formula (IV):

or a salt thereof wherein R4 and R8 are as defined in formula (I): (b) the reaction of a phenol or aniline of formula (V):

or an O-- or N- metal derivative thereof (such as an alkali metal derivative) wherein X, R', R2 and R3 are as defined in formula (I) with a compound of formula (VI)::

wherein R, R4 and R5 are as defined in formula (I) and V is a leaving group derived from a suitable organic or inorganic acid, such as halo (e.g. chloro, bromo or iodo), alkylsulphonyloxy or arylsulphonyloxy (e.g. ptoluenesulphonyloxy); (c) the reaction of a compound of formula (VII):

wherein R', R2, R3, X, R and R4 are as defined in formula (I) with a compound of formula (VIII): W-R5 wherein R5 is as defined is formula (I) and W is a leaving group such as halo; (d) the reaction of a compound of formula (IX):

wherein RI, R2, R3, X and R are defined in formula (I) and Mo is one equivalent of a metal ion, such as K+ or Na+ with a compound of formula (X)::

wherein R4 and R5 are as defined in formula (I) and V is as defined in relation to formula (VI); (e) for those compounds where B is S, the reaction of a compound of formula (XI):

wherein R', R2, R3, X, R, R4 and R5 are as defined in formula (I) with P2S8 or other suitable inorganic sulphides; (f) for those compounds where R4 is hydrogen, the reaction of a compound of formula (XII):

wherein R', R2, R3, X and R are as defined in formula (I) or a compound of formula IX as hereinbefore defined with a compound of formula (XIII):

wherein R6 is as defined in formula (I); and (g) for those compounds where B is O or S and R6 is NR9R'0 where R9 is hydrogen, the reaction of a compound of formula (XIV):

wherein R', R2, R3, X, R and R4 are as defined in formula (I) with a compound of formula (XV): R'O-N = C = B wherein R is as defined in formula (I) and B is O or S.

Process (a) will normally be effected in a dry aprotic solvent, such as ether, chloroform or dichloromethane, at a moderate temperature, such as - 30 to 50"C, e.g. at ambient temperature.

Processes (b) and (d) will normally be effected in a dry polar solvent, such as a ketone, e.g.

butanone, preferably at an elevated temperature, e.g. at reflux.

Process (c) will normally be effected in a dry polar solvent, such as ether or dichloromethane, at ambient or depressed temperature, e.g. - 20"C to room temperature.

Process (e) will normally be effected in a dry aprotic solvent, such as benzene or pyridine, at ambient or elevated temperature, e.g. at reflux.

Process (f) will normally be effected in an an hydros solvent at an elevated temperature, such as refluxing tetralin or diphenyl, in the presence of aluminium trichloride.

Process (g) will normally be effected in a dry aprotic solvent, such as ether, at ambient or depressed temperature, such as - 20'C to room temperature, e.g. about 0 C.

The anilino compounds of formula (I) may be isolated from the reaction mixture as the free base or in the form of an acid addition salt. The bases may be converted into acid addition salts thereof by known techniques with the aid of the approriate acid, and salts of the compounds may also be converted into the free bases or into other acid addition salts.

For use as a pesticide the anilino compounds of formula (I) may be presented in the form of their free bases, or as acid addition salts thereof. Suitable salts of formula (I) include hydrohalide, sulphate, nitrate, phosphate, thiocyanate, acetate, propionate, stearate, naphthenate, perchlorate, benzoate, methanesulphonate, ethanesulphonate, tosylate and benzenesulphonate acid addition salts thereof.

The compounds of formula (I) may be used to combat insects, ticks, mites, and other arthropods including free living arthropods and those which are ectoparasites of plants, mammals and birds. They are especially useful for the control of acarine ectoparasites of animals, particularly those ticks of the genera Boophilus, Rhipicephalus, Amblyomma, Hyalomma, Ixodes, Haemaphysalis, Dermacentor, and Anocentor; mites of veterinary importance, such as Psoroptes spp., Psorergates, spp., Sarcoptes spp., Chorioptesspp. and Demodex spp., e.g. the sheep scab mite Psoroptes ovis; and other ectoparasites of the sub-Orders Ixodoidea and Sarcoptiformes; and Tetranychus species on plants. Such ectoparasites infest stock and domestic animals and fowls, depending upon the location of the host and the particular ectoparasites.Common hosts are cattle, pigs, sheep, goats, horses, camels, chickens, dogs and cats.

The compounds of formula (I) may be used alone or in combination with an additive which may take the form of one or more of the carriers used in the formulation art, such as; wetting, diluting, stabilising, thickening, emulsifying, dispersing or surface active agents or other standard carrier ingredients.

A formulation may be an aqueous solution of an acid addition salt of a compound of formula (I), or a suspension of a compound of formula (I) in water, and may be used alone or in combination with suitable surface active agents. The formulation per se may be used alone or diluted in water for application to the pests or their immediate environment by way of spraying, dipping, or other known means of application.

A formulation may be in the form of a water-miscible oil comprising a compound of formula (I) per se or, when X is NA, or B is NR7, with an equimolar quantity of a suitable organic acid, such as oleic acid or naphthenic acid, to provide a salt soluble in organic solvents and emulsifiers, and is applied as an emulsion by way of spraying or dipping.

A formulation may be a non-aqueous solution or suspension of compound (I) in a suitable organic solvent for the direct application by the 'pour-on' method. A formulation may also take the form of a wettable powder for dilution with water and application by dipping or spraying.

Other solid formulations may also be used for direct application with dilution such as dusts, powders and granules.

Formulations may also be in the form of an aerosol, a foam or an impregnated article, such as a tag or collar. These may be prepared using conventional techniques.

A further formulation may be a paste, grease or gel containing a compound of formula (I) and a suitable carrier, and may be applied by spreading the formulation over the infested area.

A compound of formula (I) is preferably present in a pesticidal formulation in an amount between 1 and 80%, particularly preferred formulations containing about 20%, calculated by weight of the compound (I) per se. The concentration of a compound of formula (I) applied to the pests or their immediate environment may be in the range of 0.001%-20%, calculated by weight of the compound (I) per se.

It will be appreciated from the foregoing that what we will claim may comprise any novel feature described herein, principally and not exclusively, for example:- (a) A compound of formula (I); (b) A method of preparation of a compound of formula (I) (c) A method of controlling arthropod pests, particularly members of the Order Acarina, by applying to the pest or the pest's environment a compound of formula (I): (d) A pesticidal formulation comprising a compound of formula (I) and a carrier therefor.

(e) A method of making a formulation comprising admixture of a carrier and a compound of formula (I).

(f) A compound of formula (I) for use as a pesticide.

(g) Novel intermediates used in processes (a)-(g).

EXAMPLE 1 N-r(2, 3-Dimethyiphenoxyj-N'-ethoxycarbony!ethane- 1, 2-diamine (i) A stirred suspension of ethyl (2,3-dimethylphenoxy)acetimidate hydrochloride (13 g) in dry ether (100 ml) was treated with dry triethylamine (5.399). The resultant mixture was treated with dry gaseous hydrogen sulphide for 2 hours at 0" and set aside at 0-5" overnight. The resulting solids were removed by filtration and the filtrate evaporated to dryness to yield ethyl thiono (2,3-dimethylphenoxy)acetate as a colourless solid, m.p. 39-40" (ii) A solution of N-ethoxycarbonylethane-1,2-diamine (2g) in dry chloroform (10 ml) was added dropwise to a stirred solution of ethyl thiono (2,3-dimethylphenoxy) acetate (3.49) in dry chloroform (30 ml) at ambient temperature.After stirring overnight the solvent was removed under reduced pressure and the resulting solid recrystallised from isopropanol to yield the title product, 104-105"C.

Example 2. N-r(2, 3-dimethylphenoxy) thioacetyl]-N '-Phenylthiocarbamoyl- 1, 2-diaminoethane.

(i) A solution of ethyl thiono-(2,3-dimethylphenoxy)-acetate (2.85g, 5% molar excess) in dry ether (10 ml) was added dropwise to a stirred ethereal solution (30 ml) of dry 1,2diaminoethane (0.69g) at 0 C. After 1-2 hours tic analysis indicated completion of reaction.

(ii) The ethereal solution resulting from the previous reaction was treated with an equimolar solution of phenyl isothiocyanate (1.55g) in dry ether (10my) at O"C and the stirred reaction mixture allowed to rise to ambient temperature overnight. The title compound was recovered by filtration and subsequent vacuum desiccation; mp 112-113"C.

Examples 3 to 10 By methods analogous to those described in Examples 1 and 2 above, the compounds of examples 3 to 10 below were prepared.

Example 3. N-r(2, 3-dimethylphenoxy)-thioacetyl]-N'-(benzyloxycarbonyl)ethane- 1.2-diamine; m p 91 -92'C.

Example 4. N-r(2, 3-dimethylphenoxyl-thioacetylj-N'-(4-chlornphenyl carbamoyl)-ethane- 1, 2-diam- ine;mp 110"C.

Example 5. N-[(2, 3-dimethylphenoxy)-thioacetyl]-N'-(methylthiocarbamoylJ-ethane- 1, 2-diamine; mp 120"C.

Example 6. N, N'-Bis(Z 3-dimethylphenoxy)-thioacetyq-ethane- 1, 2-diamine; m p 168 C.

Example 7. N-[(2, 3-dimethylphenoxy)thioacetyl]-N'-acetyl-ethane- 1,2-diamine; mp 119- 121 C.

Example 8. N-(2, 3-dimethylphenoxy)-thioacetyl]-N'-[3-phenoxybenzZloxycarbonyl]-ethane- 1, 2-diamine; mp 76'C.

Example 9. N-[(2, 3-dimethylphenoxy)-thioacetyl]-N'-(4-methoxybenzoyl)-ethane- 1, 2-diamine; mp 148-149"C.

Example 10. N-f(2, 3-dimethylphenoxyl-Thioacetyq-N',(N"-meThyl-N "Lphenylcarbamoyl)ethane- 1,2-diamine; mp 111-113"C.

EXAMPLE 11 Engorged female ticks of the Biarra Strain of Boophilus microplus are immersed in groups of 20 ticks per concentration in a range of dilutions of the compound under test. The wash is prepared immediately prior to the test by dilution (with water) of the compound under test. The constituents may be in the form of miscible oil or wettable powder formulation.

The desired range of concentrations for the test is obtained by further dilution of the master solution or wash.

The ticks are removed from the wash after 10 minutes, dried, and stuck dorsal side down on double-sided adhesive tape.

They remain in this position for 14 days when the proportions of viable eggs laid are determined. From this data a regression line is plotted (concentration against % inhibition of viable egg production) and the IR50 and IR99 (concentrations at which 50% and 99% inhibition respectively of viable egg production occurs).

TABLE I Compound IR50 IR99 Urethane product of Example I 0.018 0.10 In a similar manner the IR50 of other compounds of the invention against Boophilus microplus Biarra was determined. The results are shown in Table 1 a.

Table la.

Compound of IR50 Example No. ( /0) 2 0.00061 3 0.004 4 (42% inhibition at 0.01 %) 5 (85% inhibition at 0.03%) 6 0.03 7 (100% inhibition at 0.03%) In a further test using the compound of Example 1, the IR50 and lR99 were determined as 0.0054% and 0.029%, respectively.

EXAMPLE 12 Test compounds were formulated in polyethyleneglycol and 0.622 /11 was injected into ticks at a site just ventral to the mouth parts. After 1 4 days the percentage inhibition of viable egg production (IR) was determined. The results are shown in Table 2 below.

TABLE 2 Compound %IR Urethane Product of Example i 80% at 10 mg/ml.

50% at 1.0 mg/ml.

100% at 0.1 mg/ml.

In a similar manner, other compounds of the invention were tested against ticks. The result are shown in Table 2a.

Table 2a Compound of %IR Example No. at 1 mg-ml 2 80 3 30 4 30 EXAMPLE 13-WETTABLE POWDER Active compound 25.0 parts by weight Kaolin 69.5 parts by weight Sodium Alkyl Naphthalenesulphonate 2.5 parts by weight Sodium Salt of Condensed Naphthalene Sulphonic acid 3.0 parts by weight 100.0 EXAMPLE 14-AQUEOUS SUSPENSION Active compound 50.0 parts by weight Sodium carboxy methyl Cellulose 0.5 parts by weight Calcium lignosulphonate 5.0 parts by weight para-Chloro-meta-cresol 0.2 parts by weight Water 44.3 parts by weight 100.0 EXAMPLE 15-AQUEOUS SOLUTION Active compound 10.0 parts by weight Ethylan KEO 0.5 parts by weight Deionised water 89.5 parts by weight 100.0 EXAMPLE 16-WATER-MISCIBLE OIL Active compound 10.0 parts by weight Ethylan KEO 20.0 parts by weight "Esso 200" 70.0 parts by weight 100.0 EXAMPLE 17-PASTE Active compound 45.0 parts by weight Glycerol 5.0 parts by weight Xanthan Gum 2.5 parts by weight Metyl para-Hydroxy-Benzoic Acid 0.2 parts by weight Fine Silica 5.0 parts by weight Water 42.3 parts by weight 100.0 EXAMPLE 18-POUR-ON Active compound 2.0 parts by weight Corn oil 83.0 parts by weight Iso-propanol 15.0 parts by weight 100.0 EXAMPLE 19-DUST Active compound 1.0 parts by weight Talc 99.0 parts by weight 100.0 EXAMPLE 20-GREASE Active compound 1.5 parts by weight White petroleum jelly 8.5 parts by weight 100.0

Claims

1. A compound of formula (I):

wherein R', R2 and R3 are the same or different and are selected from hydrogen, alkyl, alkoxy, halo, cyano and trifluoromethyl or two of R', R2 and R3 are linked to form a 3 or 4 carbon atom group; X is O or NA where A is hydrogen or alkyl; R is hydrogen or alkyl;R4 is hydrogen; alkyl; substituted aklkyl where the substituent(s) are selected from halo, hydroxy, cyano, alkoxy, aryloxy, alkylthio, arylthio and substituted amino; alkynyl; alkenyl; haloalkenyl; aralkyl; aryl; or substituted aralkyl or aryl where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl; and R5 is a group

where B is 0, S or NR7 where R7 is hydrogen, cyano, alkoxy, alkyl, aryl, aralkyl or substituted aryl or aralkyl where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl; and R6 is hydrogen or a group R8, OR8, SR8 or NR9R10 where R8 is alkyl, aryloxyalkyl, alkenyl, aralkyl, aryl or substituted aryl, aryloxyalkyl or aralkyl where the substituents are selected from alkyl, alkoxy, halo, cyano and trifluoromethyl; and R9 and R'O are the same or different and are selected from hydrogen, alkyl, aralkyl, aryl and substituted aryl or aralkyl where the substituents are selected from alkyl, alkoxy, halo, cyano or trifluoromethyl; or an acid addition salt thereof when X is NA or B is NR7.

2. A compound according to claim 1 which is of formula (ill):

wherein R', R2, R3, X and R are as defined in claim 1 and Y is alkyl, alkenyl, aryl or aralkyl; or an acid addition salt thereof when X is NA.

3. A compound according to claim 1 or claim 2 wherein X is O or NH and R is hydrogen or methyl.

4. A compound according to any of claims 1 to 3 wherein R' and R2 are in the 2- and 3positions, respectively, and are each halo or alkyl and R3 is hydrogen.

5. A compound according to claim 4 wherein R' and R2 are both methyl.

6. A compound according to any of claims 1 to 5 wherein R4 is hydrogen.

7. A compound according to any of claims 2 to 5 wherein Y is alkyl or aralkyl.

8. A compound according to any of claims 1 and 3 to 6 wherein B is S or 0 and R6 is methyl or optionally substituted phenylamino.

9. A compound according to any preceding claim which is selected from: N-[(2, 3-dimethylphenoxy)thioacetylj-N '-ethoxycarbonylethane-1 , 2-diamine; N-[(2,3-dimethylphenoxy)thioacetylN1-phenylthiocarbamoyk 1 , 2-diaminoethane; N-[(2, 3-dimethylphenoxy)-thioacetyl]-N'-(benzyloxycarbonyl)-ethane- 1 2-diamine; N-[(2, 3-dimethylphenoxy)-thioacetyl]-N'-(4-chlorophenylcarbamoyl)-ethane-1 2-diamine; N-[(2, 3-dimethylphenoxy)-thiacetyl]-N'-(methylthiocarbamoyl)-ethane-1 , 2-diamine; N, N'-bis[(2, 3-dimethylphenoxy)thioacetylethane-1 ,2-diamine; and N-[(2, 3-dimethylphenoxy)thioacetyl]-N'-acetyl-ethane-1 , 2-diamine.

10. A pesticidal formulation comprising as active ingredient a compound as defined in any of claims 1 to 9 and a carrier therefor.

11. A method of controlling arthropod pests comprising the application to the pest or its environment of a compound according to any of claims 1 to 9 or a formulation according to claim 10.

1 2. A process for the preparation of a compound of formula (I) as defined in claim 1 or an acid addition salt thereof when X is NA or B is NR7 comprising (a) the reaction of a compound of formula (Ill):

with a compound of formula (IV):

or a salt thereof wherein R', R2, R3, X, R, R4 and R5 are as defined in formula (I) and Z is a leaving group; (b) the reaction of a phenol or aniline of formula (V):

or an 0- or N-metal derivative thereof with a compound of formula (IV):

wherein R',R2, R3, X, R, R4 and R5 are as defined in formula (I) and V is a leaving group; (c) the reaction of a compound of formula (VII):

with a compound of formula (VIII):: W-R5 (oil) wherein R', R2, R3, X, R, R4 and R5 are as defined in formula (I) and W is a leaving group; (d) the reaction of a compound of formula (IX):

with a compound of formula (X):

wherein R1, R2, R3, X, R, R4 and R5 are as defined in formula (I), '3M is one equivalent of a metal ion, and V is as defined in formula (VI); (e) for those compounds where B is S, the reaction of a compound of formula (Xl):

wherein R1, R2, R3, X, R, R4 and R5 are as defined in formula (I) with an inorganic sulphide.

(f) for those compounds where R4 is hydrogen, the reaction of a compound of formula (XII):

or a compound of formula (IX) with a compound of formula (XIII):

wherein R', R2, R3, X, R and R5 are as defined in formula (I); or (g) for those compounds where R5 is CO.NHR10 or CS.NHR10 the reaction of a compound of formula (XIV):

with a compound of formula (XV): R10-N = C = B (XV) wherein R', R2, R3, X, R, R4 and R'O are as defined in formula (I) and B is O or S; and thereafter, if desired when X is NA or B is NR7, converting the product to an acid addition salt, or converting an acid addition salt to the free base or an alternative acid addition salt.

13. The use of a compound according to any of claims 1 to 9 in the method of claim 11.