Synthesis of 1-Aryl-1,3-dihydrobenzo[c]thiophenes by Acid-Mediated Cyclization of 1-[Aryl(methoxy)methyl]-2-[(tert-butylsulfanyl)methyl]benzenes
摘要:
A convenient method for the preparation of 1-aryl-1,3-dihydrobenzo[c]thiophenes has been developed using a three-step sequence starting from 2-[aryl(methoxy)methyl]benzyl alcohols. Thus, treatment of the starting materials with thionyl chloride gives the corresponding benzyl chlorides, which are allowed to react with sodium tert-butyl mercaptide to yield 1-aryl(methoxy)methyl]-2-[(tert-butylsulfanyl)methyl]benzenes. Finally, these compounds undergo cyclization on treatment with concentrated hydrobromic acid to provide the desired products in reasonable yields.