Generation of the Dihydro-5H-Thiazolo[3,2-a]pyridin-3-one Ring System by Proton Loss from Isothiomünchnones
摘要:
Dihydro-5H-thiazolo[3,2-a]pyridin-3-ones are easily generated by proton loss from isothiomunchnones. The closely related tetrahydro-2H-pyrido[2,1-b]-[1,3]thiazin-4-one ring system was prepared by treating piperidine-2-thione with acryloyl chloride. These cyclic S,N-ketene acetals undergo smooth reaction with different electrophiles in the presence of Lewis acids.