Helvetica Chimica Acta

Synthesis of 2??Oxo??2H??[1, 2, 4] oxadiazolo??[2, 3??c] pyrimidine??5??carbamates

U Hengartner, JC Muller, H Ramuz

Index: Hengartner, Urs; Muller, Jean-Claude; Ramuz, Henri Helvetica Chimica Acta, 1983 , vol. 66, # 2 p. 669 - 672

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Citation Number: 4

Abstract

HELVETICA CHIMICA ACTA- Vo1.66, Fasc.2 (1983)-Nr.61 ... 61. Synthesis of 2-0x0-2H-[ 1,2,4]oxadiazolo-[2,3-c~pyrimidine-5- carbamates ... Dedicated to Prof. Albert Hiirlimann on the occasion of his 60th birthday ... Summary Thermal cyclization of the pyrimidine-N-oxide dicarbamate 2 gives a 95 : 5 mixture of the 2-0x0-2 H-[ 1,2,4]oxadiazoIo [2,3-a]- and [2,3-~]pyrimidinecarba - mates 3 and 4. An efficient procedure for the conversion of 3 to 4, and vice versa, is ...