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Pyrido[2,3-d]pyrimidines. 2. Reactions of 2,4,5-trioxo-7-amino-8H-pyrido[2,3-d]pyrimidines with electrophilic agents

✍ Scribed by O. A. Burova; I. D. Bystryakova; N. M. Smirnova; T. S. Safonova


Publisher
Springer US
Year
1990
Tongue
English
Weight
315 KB
Volume
26
Category
Article
ISSN
0009-3122

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Ring closure reactions of pyrido[2,3-d]p
✍ Dang Van Tinh; Wolfgang Stadlbauer πŸ“‚ Article πŸ“… 2008 πŸ› Journal of Heterocyclic Chemistry 🌐 English βš– 419 KB

## Abstract magnified image The cyclocondensation of 5‐hydroxy‐pyrido[2,3‐__d__]pyrimidines **1** with malonates gives pyrano[2β€²,3β€²:4,5]‐pyrido[2,3‐__d__]pyrimidines **2**. Nitration of **1** and reduction with zinc in the presence of carboxylic acids/anhydrides gave 2‐alkyloxazolo[5β€²,4β€²:4,5]pyrid