Cationic 1, 3??diazadienes in annulation reactions. Synthesis of pyrimidine, thiadiazinedioxide and triazine derivatives

C Landreau, D Deniaud, A Reliquet…

Index: Landreau; Deniaud; Reliquet; Meslin Journal of Heterocyclic Chemistry, 2001 , vol. 38, # 1 p. 93 - 98

Full Text: HTML

Citation Number: 31

Abstract

Abstract Triazapentadienium iodides 2 prepared from N'-thiocarbamoylformamidines 1 are efficient intermediates in heterocyclic synthesis. They react with ketenes, sulfenes, phenyl isocyanate or isothiocyanate and dimethyl acetylenedicarboxylate affording the corresponding dihydropyrimidinones 3, thiadiazinedioxides 5, triazinones 6, triazinethiones 7 and pyrimidines 9.