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■ The Novel Ring Opening of an Oxazolo[5,4-d]pyrimidine and Subsequent Rearrangement to Form an Imidazo[4,5-d]pyrimidine

Ji-Wang Chern, Dean S. Wise, and Leroy B. Townsend*

*Department of Medical Chemistry, College of Pharmacy, University of Michigan , 930 North University, Ann Arbor, MI 48109-1055, U.S.A.

Abstract

A novel rearrangement from methyl 6-amino-4-benzylaminooxazolo-[5,4-d]pyrimidine-2-carbmate to methyl 9-benzylguanine-8-carbamate (3) is described.