PURPOSE: To obtain a 5-acyloxypyrazole useful as an intermediate for magenta couplers in high yield, by reacting a 5-hydroxypyrazole having an amino group in the molecule with an acylating agent, etc. in the presence of a tertiary amine compound.
CONSTITUTION: A 5-hydroxypyrazole of formulaI(R1 is amino, benzamido, anilino, ureido, pyrrolidino, etc.; R2 is alkyl or aryl; R3 is H, alkoxyl, aryloxy, heterocyclic oxy, etc.) is reacted with an acylating agent of formula III (R7 is halogen; R8 is alkyl, aryl, heterocyclic group, etc.) or a sulfonylating agent of formula IV (R9 and R10 are the same as R7 and R8) in the presence of a tertiary amine of formula II (R4 and R5 are 1W3C alkyl; R6 is R4, R5, aryl, etc., provided that R4, R5 and R6 may link to form a ring) at 0W50°C to give a 5-acyloxypyrazole or 5-sulfonyloxypyrazole, e.g. the compound of formula V.
SATOU RIYOUSUKE
KIMURA KAZUHIKO
