Intermolecular Tandem Addition−Cyclization of Bromoallenes: A Facile Synthesis of Methylenecyclopropyl Carboxylates and Polysubstituted Furans
摘要:
The base-mediated reactions of 1,3-dicarbonyl compounds with bromoallenes used as an allyl dication equivalent were explored. The corresponding dimethyl methylenecyclopropane-1,1-dicarboxylates and 2,3,4-trisubstituted furans were efficiently synthesized.
A<i>n</i>BuLi-Mediated, Expeditious and Stereoselective Ring-Opening Rearrangement of (Arylmethylene)cyclopropane-1,1-dicarboxylates
作者:Bao Hu、Linan Jiang、Jun Ren、Zhongwen Wang
DOI:10.1002/ejoc.200901165
日期:2010.3
We report herein an nBuLi-mediated, expeditious, ring-openingrearrangement of (arylmethylene)cyclopropane 1,1-diesters to prepare 1,3-diene derivatives with good stereoselectivity. The reaction mechanism has also been discussed.
Intermolecular Tandem Addition−Cyclization of Bromoallenes: A Facile Synthesis of Methylenecyclopropyl Carboxylates and Polysubstituted Furans
作者:Lubin Xu、Xian Huang、Fangrui Zhong
DOI:10.1021/ol061993u
日期:2006.10.1
The base-mediated reactions of 1,3-dicarbonyl compounds with bromoallenes used as an allyl dication equivalent were explored. The corresponding dimethyl methylenecyclopropane-1,1-dicarboxylates and 2,3,4-trisubstituted furans were efficiently synthesized.
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