Alpha-methylenecyclopentanone derivative and process for producing the same

摘要

Disclosed herein is an alpha -methylenecyclopentanone derivative represented by the formula [ I ] below which is useful as an intermediate for pharmaceuticals and insecticides, especially prostaglandins. Also disclosed herein is a process for producing the derivative advantageously on an industrial scale. where X denotes ( alpha - OZ, beta - H) or ( alpha - H, beta - OZ), with Z representing a protecting group for the hydroxyl group; U denotes ( alpha - H, beta - R<1>) or ( beta - R<1>, alpha - H); R<1> denotes where R<2> denotes a protected hydroxyl group, a substituted or unsubstituted C1-15 alkyl group, a substituted or unsubstituted C2-15 alkenyl group, a substituted or unsubstituted C2-15 alkynyl aryl group; Z' denotes a protecting group for the hydroxyl group; and k is 0 or 1).