Patent ID: 8586753

Claim:
A process for the preparation of a compound of formula (I) in which R 1 is hydroxy, halogen, alkoxy, or aryloxy, R 2 is hydroxy, alkoxy, arylalkoxy, halogen, O—(C═O)alkyl, O—(C═O)O-alkyl, O(C═O)haloalkyl, OSO 2 alkyl, OSO 2 -haloalkyl, or OSO 2 -aryl, A is alkyl or is in which R 3 is halogen, CN, NO 2 , alkyl, cycloalkyl, haloalkyl, halocycloalkyl, alkoxy, haloalkoxy, alkylamino, dialkylamino, or cycloalkylamino, and Z is CH or N, comprising, reacting a compound of formula (II) in which R 4 and R 5 independently of one another are hydrogen, alkyl, aryl, arylalkyl, or alkoxy, or R 4 and R 5 taken together can form a 4-, 5- or 6-membered, saturated, optionally substituted ring which can contain 1-2 heteroatoms from the series N, S, O, R 6 is trihalomethyl, (C═O)Oalkyl, or (C═O)Ohaloalkyl, n is 0 or 1, with an alkyl- or arylhydrazine of formula (III) A-NHNH 2 (III), in which A is alkyl or is in which R 3 is halogen, CN, NO 2 , alkyl, cycloalkyl, haloalkyl, halocycloalkyl, alkoxy, haloalkoxy, alkylamino, dialkylamino, or cycloalkylamino, Z is CH or N, in the presence of a solvent to obtain a compound of formula (IV), in which R 6 and A are defined above, wherein said compound of formula (IV) is optionally further reacted without prior isolation with elimination of water, in the presence of a solvent, to obtain a compound of formula (V) in which R 2 , R 6 and A are defined above, wherein said compound of formula (V) is reacted in the presence of a solvent to obtain a compound of formula (I), in which R 1 , R 2 and A are defined above.