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ChemInform Abstract: Generation of Oxodiazonium Ions. Part 1. Synthesis of [1,2,5]Oxadiazolo[3,4-c]cinnoline 5-Oxides.

✍ Scribed by M. S. Klenov; M. O. Ratnikov; A. M. Churakov; V. N. Solkan; Yu. A. Strelenko; V. A. Tartakovsky

Publisher
John Wiley and Sons
Year
2012
Weight
30 KB
Volume
43
Category
Article
ISSN
0931-7597

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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.