Processes for preparing alkyl 3-(4-tetrahydropyranyl)-3-oxopropanoate compound and 4-acyltetrahydropyrane

摘要

The present invention is to provide a process for preparing an alkyl 3-(4-tetrahydropyranyl)-3-oxopropanoate compound represented by the formula (1): wherein R¹ and R² may be the same or different from each other, and represent a group which does not participate in the reaction, and R¹ and R² may be bonded to form a ring, and the ring may contain a hetero atom(s), and R³ represents a hydrocarbon group, which comprises reacting 4-acyltetrahydropyran represented by the formula (2): wherein R¹ and R² have the same meanings as defined above, and a carbonic acid diester represented by the formula (3): wherein R³ has the same meanings as defined above, and two R³s may be bonded to each other to form a ring, in the presence of a base, and a process for preparing 4-acyltetrahydropyran.