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■ Synthesis of 3-Ethylpyrazolo[3,4-e][1,3]oxazin-5,7-dione, a Derivative of a New Heterocyclic Ring System

Vladimir G. Beylin and Leroy B. Townsend*

*Department of Chemisry, University of Michigan , 930 North University, Ann Arbor, MI 48109-1055, U.S.A.

Abstract

The Synthesis of 3-ethylpyrazolo[3,4-e][1,3]oxanin-5,7-dione, a derivative of a new ring system, by annulation of 3(5)-ethyl-4-hydroxy-5(3)-carboxamidopyrazole with ethyl chloroformate or N,N’-carbonyldiimidazole is described.