Direct chemical synthesis of β-mannopyranosides and other glycosides via glycosyl triflates
作者:David Crich、Sanxing Sun
DOI:10.1016/s0040-4020(98)00426-8
日期:1998.7
High yield, highly stereoselectivemethods for the synthesis of β-mannopyranosides of primary, secondary, and tertiary alcohols are presented. Activation of mannosyl sulfoxides or mannosyl thioglycosides with trifluoromethanesulfonic anhydride or benzenesulfenyl triflate, respectively, leads to the efficient formation of α-mannosyl triflates at −78 °C in dichloromethane, in the presence of 2,6-di-