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Studies on Uracils: Synthesis of Novel Pyrido[2,3-d]pyrimidine Oxides via Ring Transformation of Isoxazolo[3,4-d]pyrimidine.

✍ Scribed by P. J. Bhuyan; H. N. Borah; R. C. Boruah

Publisher
John Wiley and Sons
Year
2003
Weight
87 KB
Volume
34
Category
Article
ISSN
0931-7597

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✦ Synopsis

Abstract

For Abstract see ChemInform Abstract in Full Text.

📜 SIMILAR VOLUMES

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## Abstract The novel 7‐hydrazino‐1,3‐dimethylpyrido[2,3‐__d__]pyrimidine‐2,4(1__H__,3__H__)‐dione (**2**) gives the hydrazine derivatives **3, 5, 6, 8**, and **10**. The __s__‐triazolo[4′,3′: 1,6]pyrido[2,3‐__d__]pyrimidine **4** is prepared from **3**, while the attempted cyclizations of **5, 6**

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Ring closure reactions of pyrido[2,3-d]p
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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