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Pyrido[2,3-d]dipyrimidines 8. Synthesis of pyrrolo(2′,3′∶4,5)pyrido[2,3-d]pyrimidines

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


Publisher
Springer US
Year
1993
Tongue
English
Weight
308 KB
Volume
29
Category
Article
ISSN
0009-3122

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Ring closure reactions of pyrido[2,3-d]p
✍ Dang Van Tinh; Wolfgang Stadlbauer 📂 Article 📅 2008 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 419 KB

## Abstract magnified image The cyclocondensation of 5‐hydroxy‐pyrido[2,3‐__d__]pyrimidines **1** with malonates gives pyrano[2′,3′: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[5′,4′:4,5]pyrid