Zur Synthese mesomerer Pyrimidinbetaine

摘要

N.N′-disubstituted amidines react with monosubstituted 2.4.6-trichlorophenyl malonates (2 a-d) yielding mesoionic compounds with a six-membered ring. The 2-aminopyridines1 a-creact in the same way to give the bicyclic mesomeric betaines3 b-g. 3 ais obtained by the action of carbon suboxide (C3O2) on1