Lewis Acid Catalyzed Ring-Opening Intramolecular Friedel−Crafts Alkylation of Methylenecyclopropane 1,1-Diesters
摘要:
The first Friedel-Crafts reaction initiated by the direct generation of a carbocation at the C3 position of MCP 1,1-diesters through distal-bond cleavage was presented. The described method supplied a new synthetic strategy to prepare indene and hydronaphthalene derivatives in moderate to excellent yields under mild conditions.
Lewis acid-catalyzed nucleophilic ring-opening/intramolecular Conia-ene reactions of methylenecyclopropane 1,1-diesters with propargyl alcohols
作者:Bao Hu、Jun Ren、Zhongwen Wang
DOI:10.1016/j.tet.2010.11.048
日期:2011.1
Lewis acid-catalyzednucleophilic ring opening of methylenecyclopropane (MCP) 1,1-diesters with propargyl alcohols. Unlike the proximal-bond cleavage mode observed in cases of unactivated MCPs, the intrinsic characteristic of MCP 1,1-diesters gave a regiospecific distal-bond cleavage under attack of propargyl alcohols as nucleophiles. By combining a subsequent intramolecular Conia-ene reaction, 3,5