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Synthesis of pyrido[2,3-d]pyrimidinones by the reaction of aminopyrimidin-4-ones with benzylidene meldrum's acid derivatives

✍ Scribed by Jairo Quiroga; Angelina Hormaza; Braulio Insuasty; Manuel Nogueras; Adolfo Sánchez; Norbert Hanold; Herbert Meier

Publisher
Journal of Heterocyclic Chemistry
Year
1997
Tongue
English
Weight
201 KB
Volume
34
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

A series of pyrido[2,3‐d]pyrimidine‐4,7‐diones 5a‐h were prepared from 6‐amino‐4‐pyrimidones 1 and benzylidene Meldrum's acid derivatives 2 by cyclization reactions in boiling nitrobenzene. The structure of 5, determined by nmr measurements, reveals a selective orientation of 1 and 2 in the addition step.

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