PROCESS FOR PRODUCING ESTER COMPOUND

摘要

Compound (1) or a salt that is useful as an intermediate for the production of a medicine, an agrochemical or the like can be produced by a process including the following steps: (A) reacting an aldehyde (2) with nitromethane to produce a nitroaldehyde; (B) reacting the nitroaldehyde with an alcohol to produce a nitroacetal; (C) reducing the nitroacetal to produce an aminoacetal; (D) protecting an amino group in the aminoacetal to produce a protected aminoacetal; (E) treating the protected aminoacetal with an acid and subsequently with a base and then reacting the resultant product with a cyanating agent to produce a nitrile; (F) hydrolyzing the nitrile to produce a protected amino acid; and (G) substituting a group R5 in the protected amino acid by a hydrogen atom and protecting a carboxyl group therein.