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Pyrido[2,3-d]pyrimidines. II. Synthesis of ribonucleosides of 4-oxo- and 2,4-dioxopyrido[2,3-d]pyrimidines

✍ Scribed by Rizkalla, Boshra H.; Broom, Arthur D.; Stout, Mason G.; Robins, Roland K.

Book ID: 127056228
Publisher: American Chemical Society
Year: 1972
Tongue: English
Weight: 623 KB
Volume: 37
Category: Article
ISSN: 0022-3263
DOI: 10.1021/jo00798a001

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## 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