Processes for production of oxadiazoline derivatives

Details Processes for production of oxadiazoline derivatives Processes for production of oxadiazoline derivatives

C - Chemistry, Metallurgy

07

D

C07D 271/06 (2006.01) C07D 261/08 (2006.01) C07D 413/04 (2006.01) C07D 413/14 (2006.01)

Patent

CA 2390420

A process as represented by reaction scheme (a), which permits industrial mass production of .DELTA.2-1,2,4-oxadiazoline derivatives having excellent insecticidal effects or salts thereof in high yield with advantage, [wherein X1 is halogeno; R1 is optionally substituted alkyl, optionally substituted acyl, or ClCO; R2 is (1) halogeno, (2) C1-6 haloalkyl, (3) C1-6 haloalkoxy, or (4) phenyl optionally substituted with C1-6 haloalkyl; A is nitrogen or =CR3- (wherein R3 is Cl or CN); R4 is C1-6 alkyl or C1-6 haloalkyl; n is 0, 1 or 2; and X2 is halogeno].

L'invention se rapporte à un procédé représenté par le schéma réactionnel (a), qui permet avantageusement une production industrielle en série, à haut rendement, de dérivés de .DELTA.?2¿-1,2,4-oxadiazoline présentant d'excellentes propriétés insecticides, ou de sels de ces dérivés. Dans le schéma réactionnel A, qui représente une réaction d'ouverture de cycle, X?1¿ est halogéno; R?1¿ est alkyle éventuellement substitué, acyle éventuellement substitué, ou ClCO; R?2¿ est (1) halogéno, (2) haloalkyle C¿1-6?, (3) haloalcoxy C¿1-6? ou (4) phényle éventuellement substitué par haloalkyle C¿1-6?; A est azote ou =CR?3¿- (où R?3¿ est Cl ou CN); R?4¿ est alkyle C¿1-6? ou haloalkyle C¿1-6?; n est égal à 0, 1 ou 2; et X?2¿ est halogéno.

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