Novel Synthesis of Heterocyclic Ketene N,N-, N,O-, and N,S-Acetals Using Cyanoketene Dithioacetals
摘要:
A novel synthesis of (2,3-dihydrobenzoimidazole-2-ylidenyl)cyanoacetanilide, (2,3-dihydrobenzoxazole-2-ylidenyl)cyanoacetanilide and (2,3-dihydro-benzothiazole-2-ylidenyl)cyanoacetanilide derivatives 5a-1 via reaction of ketene dithioacetals 2a-d with o-phenylenediamine, o-aminophenol, and o-aminothiophenol 3a-c is reported and the synthetic potential of the method is demonstrated.