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Pyrido[2,3-d]pyrimidines 7. Reactions of 1,3-dimethyl-5,7-dichloro-6-nitropyrido-[2,3-d]pyrimidine-2,4-dione with amines. Synthesis of derivatives of triazolo(4′,5′:4,5)pyrido[2,3-d]pyrimidine

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

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

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Ring closure reactions of pyrido[2,3-d]p
Ring closure reactions of pyrido[2,3-d]pyrimidines to pyrano[2′,3′:4,5]- and oxazolo[5′,4′:4,5]pyrido[2,3-d]pyrimidines
✍ 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