In this paper, we wish to report the synthesis of several unknown polyfused heterocycles containing the pyrazine ring, and also to explore the utility of the oxopyrazine ... It is worthy to note that the conversion of a carboxylic acid into it5 azide was reported by Weinstock [4] to pro- ceed via the intermediacy of a mixed ester, however through the conversion of the acid 2 into the azide 3 we ... 1 ~=co,cn, 2 R= coon 3 R= CONl 4 R= CONHNH, 5 R= NHCONH, 8 R= ...
