Tandem carbocationic cyclization of bis(methylthio)methylene arylcyclopropyl ketones : A promising sequence for assembling functionalized cyclopent[a]indene framework
A novel route for assembling cyclopent[a]indene framework bearing useful functionalities has been developed through bis(methylthio) carbenium ion mediated Lewis acid induced tandem cyclization of bis(methylthio)methylene aryl cyclopropyl ketones 1b - d and the corresponding carbinols 11b-d.