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2-Oxooxazolopyridines. 1. Synthesis of alkyl N-(2-oxo-3-pyridyl)carbamates

✍ Scribed by D. Shantare; M. Yure; S. V. Belyakov; M. V. Petrova; É. Gudrinietse

Book ID: 105516574
Publisher: Springer US
Year: 1997
Tongue: English
Weight: 399 KB
Volume: 33
Category: Article
ISSN: 0009-3122
DOI: 10.1007/bf02256763

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## Abstract Thermal cyclization of the pyrimidine‐__N__‐oxide dicarbamate **2** gives a 95:5 mixture of the 2‐oxo‐2__H__‐[1,2,4]oxadiazolo[2,3‐__a__]‐ and [2,3‐__c__]pyrimidinecarbamates **3** and **4.** An efficient procedure for the conversion of **3** to **4**, and __vice versa__, is described.