Chiral Phosphine-Catalyzed Enantioselective Construction of γ-Butenolides Through Substitution of Morita−Baylis−Hillman Acetates with 2-Trimethylsilyloxy Furan
作者:Ying-Qing Jiang、Yong-Ling Shi、Min Shi
DOI:10.1021/ja802422d
日期:2008.6.1
Chiral multifunctional phosphine (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)methanesulfonamide L2 or (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)acetamide L3 is an efficient catalyst in the allylic substitutions of MBH acetates 1 with 2-trimethylsilyloxy furan 2 to provide gamma-butenolides 3 in good to excellent yields and enantiomeric excesses in the presence of water.
Diastereo- and Enantioselective Construction of γ-Butenolides through Chiral Phosphane-Catalyzed Allylic Alkylation of Morita-Baylis-Hillman Acetates
作者:Yin Wei、Guang-Ning Ma、Min Shi
DOI:10.1002/ejoc.201100704
日期:2011.9
series of multifunctional, chiral amide phosphane organocatalysts have been designed and synthesized for the allylicsubstitution of Morita-Baylis-Hillman (MBH) acetate with 2-trimethylsilyloxyfuran for butenolide synthesis. This reaction was achieved in good to excellent yield (42-98 %) and high ee (85-99 %) with respect to a wide range of substrates in absolute MeOH or CH(3)CN, using chiral amide phosphane