作者:Wen-Bin Yang、Yu-Ying Yang、Yu-Feng Gu、Shwu-Huey Wang、Che-Chien Chang、Chun-Hung Lin
DOI:10.1021/jo0255227
日期:2002.5.1
Two general methods are explored for the stereoselective synthesis of exo-glycals. One method utilizes a nucleophilic addition of fully protected sugar lactones of gluco-, galacto-, and manno-types, followed by the subsequent dehydration, to give the desired exo-glycals with (Z)-configuration. The other method proceeds with selenylation of C-glycosides in a stereoselective manner. The subsequent selenoxide
探索了两种一般方法来立体选择性合成外糖。一种方法利用亲核加成葡萄糖,半乳糖和甘露糖型的完全保护的糖内酯,随后进行脱水,以得到具有(Z)构型的期望的外糖。另一种方法以立体选择性方式进行C-糖苷的硒化。随后的亚硒酸盐消除也提供了(Z)-外糖。制备的葡萄糖型或甘露型的外糖共轭酯与烯丙醇反应,仅得到α-异头物。