Patent ID: 6080861
Filing Date: 2000-06-27
Classification: A01N,C07D

Abstract:
A process for the preparation of a compound of formula IVA ##STR15## in which R.sup.1 represents a halogen atom; an optionally substituted alkyl, alkenyl, alkinyl, alkoxy, alkoxyalkyl or alkoxyalkoxy group; a haloalkyl, haloalkoxy, cyano, nitro or SF.sub.5 group; --S(O).sub.p --R.sup.5, in which p is 0, 1 or 2, and R.sup.5 represents an alkyl or haloalkyl group;--NR.sup.6 R.sup.7, in which R.sup.6 and R.sup.7 each independently represent a hydrogen atom, an alkyl, alkenyl, aralkyl or aryl group; or R.sup.8 O--CY--, in which R.sup.8 represents an alkyl group, and Y represents O or S;which comprises the steps of(a) saponification of a compound of formula VII ##STR16## in which R.sup.1 is as described for formula IVA; R' is C.sub.1-6 alkyl; and PG represents a hydrogen atom or a protecting group, to obtain a compound of formula VIII ##STR17## (b) decarboxylation of the compound of formula VIII; and (c) optionally cleaving the protecting group.