Patent ID: 7094594

Claim:
A production process of a following compound (I); in the formula, R 1 represents a hydrogen, an alkyl group of 1 to 12 carbon atoms, an aryl group of 6 to 12 carbon atoms, or an aralkyl group of 7 to 12 carbon atoms; R 2 and R 3 each independently represents a hydrogen, an alkyl group of 1 to 12 carbon atoms, an aryl group of 6 to 12 carbon atoms, or an aralkyl group of 7 to 12 carbon atoms, and R 2 and R 3 may jointly form a ring, which comprises (1) reacting an enolate prepared by permitting a base or a 0-valent metal to act on an acetic acid ester derivative represented by the following formula (II); X 1 CH 2 CO 2 R 1 (II) in the formula, R 1 is as defined above; and X 1 represents a hydrogen or a halogen atom, with (S)-β-hydroxy-γ-butyrolactone represented by the following formula (III); at a temperature not lower than −30° C. to produce a compound represented by the following formula (IV); in the formula, R 1 , R 2 , R 3 , and R 4 are as defined above, and (5) subjecting this compound to solvolysis in the presence of a base to form the compound formula (I).