Stereoselective synthesis of β- C - d -glucopyranosides using the reaction of TMSCN and Grignard reagents with cyclic five-membered sulfonium salt intermediates
作者:Hui Liu、Irina P Smoliakova
DOI:10.1016/s0040-4020(01)00160-0
日期:2001.4
the presence of a Lewis acid, ArSCl adducts of tri-O-benzyl-d-glucal react with vinyl ethers to form cyclic five-membered sulfonium salt intermediates. The latter are capable of reacting with TMSCN and Grignard reagents furnishing exclusively 2-S-(aryl)-2-thio-β-C-d-glucopyranosides. The one-pot reaction also proceeds with high stereoselectivity of C–C bond formation in the lateral chain providing exclusively
在路易斯酸的存在下,三-O-苄基-d-葡糖醛的ArSCl加合物与乙烯基醚反应形成环状五元sulf盐中间体。后者能够与TMSCN和仅提供2- S-(芳基)-2-硫代-β- C -d-吡喃葡萄糖苷的格利雅试剂反应。一锅法反应还会在侧链中形成C–C键的立体选择性高的情况下进行,从而仅或主要提供具有侧链中手性中心的(S)-构型的C-糖苷。