| 摘要 |
Disclosed herein is an alpha -methylene-cyclopentanone 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. <IMAGE> [I] 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 -R1) or ( beta -R1, alpha -H); R1 denotes <IMAGE> where R2 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 group, or a substituted or unsubstituted C6-15 aryl group; Z' denotes a protecting group for the hydroxyl group; and k is 0 or 1).
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