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A Novel Access to Pyrido[4,3-d]pyrimidine Scaffold
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1  N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russian Federation


A general four-step approach to 1,2,3,7,8,8a-hexahydropyrido[4,3-d]pyrimidin-2-ones via Staudinger/intramolecular aza-Wittig reaction of 5-acyl-4-(β-azidoalkyl)-1,2,3,4-tetrahydropyrimidin-2-ones promoted by PPh3 was developed. Synthesis of the starting pyrimidinones included preparation of 3-azidoaldehydes by the addition of hydrazoic acid to α,β-unsaturated aldehydes, transformation of 3-azidoaldehydes into N-[(3-azido-1-tosyl)alkyl]ureas followed by the reaction with 1,3-diketone enolates and dehydration of the resulting products under acidic conditions.

Keywords: Pyrido[4,3-d]pyrimidines; Azidoaldehydes; Tetrahydropyrimidines; Amidoalkylation; Staudinger Reaction; aza-Wittig Reaction