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Communication | Special issue | Vol 15, No. 1, 1981, pp.289-292
Published online, 1st January, 1970
DOI: 10.3987/S-1981-01-0289
Cycloaddition Reaction of 5-Formyl-1,3,6-trimethyluracil with Aldehydes. New Synthetic Approach to Pyrano[4,3-d ]pyeimidines

Kosaku Hirota, Tetsuji Asao, Isao Sugiyama, and Shigeo Senda*

*Gifu Pharmaceutical University, 6-1 Mitahora-higashi 5-chome, Gifu 502-8585, Japan

Abstract

A new synthetic approach to pyrano[4,3-d]pyrimidine derivatives is described. Reaction of 5-formyl-1,3,6-trimethyluracil with aldehydes in the presence of lithium diisopropylamide affords pyrano[4,3-d]pyrimidines via a dienol intermediate.