A new approach for the synthesis of some 1,4-benzoxathiin 4,4-dioxide derivatives
作者:Ai-Long Fan、Song Cao、Zheng Zhang
DOI:10.1002/jhet.5570340603
日期:1997.11
been prepared by a new synthetic route. The reactions of 2-chloro-4-nitrobenzenethiol 1 with l-aryl-2-chloroethanones 2 in the presence of sodium hydroxide give l-aryl-2-(2-chloro-4-nitrophenylthio)ethanones 3 which on oxidation with 30% aqueous hydrogen peroxide afford l-aryl-2-(2-chloro-4-nitrophenylsulfonyl)ethanones 4. By the reactions of compounds 4 with 2-[3 or 4-(bromomethyl)phenyl]benzoxazole in