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■ New Syntheses of a Pteridine

Sadao Nishigaki, Kiyoko Fukami, Misuzu Ichiba, Hashime Kanazawa, Keiko Matsuyama, Shinobu Ogusu, Keitaro Senga,* Fumio Yoneda, Ryosuke Koga, and Toyoko Ueno

*Pharmaceutical Institute, School of Medicine, Keio University, Shinanomachi 35, Shinjuku, Tokyo 160-0016, Japan

Abstract

The reaction of 6-amino-1,3-dimethyl-5-phenylazouracil (I), 6-amino-1,3-dimethyl-5-nitrosouracil (II), or 6-hydrazino-1,3-dimethyl-5-nitrosouracil (III) with dimethyl acetylenedicarboxylate offers new synthetic route to a pteridine [6,7-bis(methoxycarbonyl)-1,3-dimethyllumazine: IV].