Patent ID: 8329935

Claim:
A process for producing a compound represented by the following formula (3): [where R 1 represents a C 1-4 alkyl group, an aryl group, a substituted aryl group, an aryl methyl group or a substituted aryl methyl group, R 3 represents a C 1-4 alkyl group, an aryl methyl group or a substituted aryl methyl group, and R 4 represents a C 2-4 alkanoyl group, a benzoyl group, a benzyl group, a C 1-4 alkyloxy carbonyl group or a benzyloxy carbonyl group] comprising: reacting a compound represented by the following formula (1): [where R 1 represents the same meaning as the definitions described above] with a compound represented by the following formula (2): [where R 2 and R 2′ represent identically or differently a C 1-4 alkyl group, an aryl group, a substituted aryl group, an aryl methyl group, or a substituted aryl methyl group, and R 3 and R 4 represent the same meaning as the definition described above] in the presence of a base.