Oxadiazine derivatives
Compounds of the formula in which A is an unsubstituted or mono- to tetrasubstituted, aromatic or non-aromatic, monocyclic or bicyclic heterocyclic radical, where one to two of the substituents of A can be selected from the group consisting of halo-C 1 -C 3 alkyl, cyclopropyl, halocyclopropyl, C 2 -C 3 alkenyl, C 2 -C 3 alkynyl, halo-C 2 -C 3 alkenyl, halo-C 2 -C 3 alkynyl, halo-C 1 -C 3 alkoxy, C 1 -C 3 alkylthio, halo-C 1 -C 3 alkylthio, allyloxy, propargyloxy, allylthio, propargylthio, haloallyloxy, haloallylthio, cyano and nitro, and one to four of the substituents of A can be selected from the group consisting of C 1 -C 3 alkyl, C 1 -C 3 alkoxy and halogen; R is hydrogen, C 1 -C 6 alkyl, phenyl-C 1 -C 4 alkyl, C 3 -C 6 cycloalkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl; and X is N—NO 2 or N—CN, and, if appropriate, tautomers thereof, in each case in free form or in salt form, can be used as agrochemical active ingredients and can be prepared in a manner known per se.
1. A process for the preparation of a compound having the general formula (I)
wherein:
A is a pyridyl, 1-oxidobyridinio or thiazolyl group, in which A is unsubstituted or mono- or disubstituted by substituents selected from the group consisting of halogen and C 1 -C 3 alkyl;
R is hydrogen, C 1 -C 6 alkyl, phenyl-C 1 -C 4 alkyl, C 3 -C 6 cycloalkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl; and
X is N—NO 2 or N—CN,
wherein said process comprises:
(A) reacting a compound of formula (II)
or a salt or tautomer thereof, with formaldehyde or paraformaldehyde at a temperature of between 0° C. and 180° C. wherein:
R 1 is hydrogen or A—CH 2 ; and
A, R and X are as defined above; and
(B) when R 1 is hydrogen in step A, further reacting the product from step A with a compound having the Formula (V)
A-CH 2 —Y (V)
wherein:
A, is as defined in Formula (I); and
Y is a leaving group
thereby to form a compound of Formula (I), or a tautomer thereof, in each case in free form or in salt form.
2. A process according to claim 1 wherein the reaction between said compound of Formula (II) with formaldehyde or paraformaldehyde occur in the presence of a base.
3. A process according to claim 1 wherein the reaction of step B is performed in the presence of a base.
4. A process according to claim 1 wherein the reaction between said compound of Formula (II) with formaldehyde or paraformaldehyde is performed in the presence of an acid catalyst.
5. A process according to claim 1 wherein the reaction the reaction of step B is performed in the presence of an acid catalyst.
6. A process according to claim 1 wherein X is N—NO 2 .
7. A process according to claim 1 wherein R is methyl.
8. A process according to claim 1 wherein A is 2-chlorothiazol-5-yl.
9. A process according to claim 1 wherein X is N—NO 2 , R is methyl and A is 2-chlorothiazol-5-yl.