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-catalyzed nucleophilic 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
我们提出了路易斯酸催化的炔丙基醇与亚甲基环丙烷(MCP)1,1-二酯的亲核开环。与未激活的MCP情况下观察到的近端键裂解模式不同,MCP 1,1-二酯的内在特征在炔丙醇作为亲核试剂的攻击下产生了区域特异性的远端键裂解。通过结合随后的分子内Conia-ene反应,可以逐步或一锅法获得3,5-二亚甲基四氢吡喃。