作者:Cornelis Timmers、Jeroen Verheijen、Gijsbert van der Marel、Jacobus van Boom
DOI:10.1055/s-1997-5756
日期:1997.7
Furanoid glycals 3, 4 and 9, containing a 3-O-silyl protecting group, are readily epoxidized with DMD to give the respective shelf-stable α-1,2-anhydrofuranoses 7, 8 and 10. The latter oxiranes react smoothly and stereoselectively under the agency of ZnCl2 with a variety of primary and allylic secondary glycosyl acceptors (e.g. 1, 11-13) resulting in the exclusive formation of β-linked disaccharides (e.g. 14-18) in yields comparable to those obtained starting from 1,2-anhydropyranoses. Furthermore, the dimeric glucofuranoside 18 was transformed into the corresponding 2'-deoxyfuranoside 20, the β-mannofuranoside 21 and the (1→2)-branched furanoside 22.
含有 3-O-甲硅烷基保护基团的呋喃糖醛 3、4 和 9 很容易被 DMD 环氧化,得到相应的货架稳定的 α-1,2-脱水呋喃糖 7、8 和 10。后者的环氧乙烷反应顺利,并且在 ZnCl2 的作用下,与各种初级和烯丙基次级糖基受体(例如 1、 11-13)立体选择性地形成β-连接二糖(例如 14-18),其产量与从 1 开始获得的产量相当, 2-脱水吡喃糖。此外,二聚呋喃葡萄糖苷 18 转化为相应的 2'-脱氧呋喃糖苷 20、β-呋喃甘露糖苷 21 和 (1→2)-支链呋喃糖苷 22。