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■ Reactions of 4-Acetylsydnones with Hydrazine: Formation of 2,4-Dihydropyrol-3-ones

Hsien-Ju Tien,* Shaw-Tao Lin,* and Mei-Lin Yang

*Department of Applied Chemistry, Providence University, 200 Chungchi Road, Sha-Lu, Taichung Hsien, 433, Taiwan, R.O.C.

Abstract

Reactions of 4-acetylsydnones with hydrazine at room temperature yielded a series of 2,4-dihydropyrazol-3-ones. The cycloaddition via sydnone rings with loss of a nitrogen oxide ion is a new type of reaction for the application of sydnone in organic synthesis.