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 stereoselective methods 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-
提出了伯醇,仲醇和叔醇的β-甘露吡喃糖苷合成的高产率,高立体选择性的方法。在存在2,6-二叔丁基-4-甲基吡啶。这些三氟甲磺酸酯反应,然后小号Ñ 2样与醇得到的β型甘露糖苷。为了实现高选择性,需要使用4,6- O-亚苄基保护的甘露糖,以及使用O -2和O上的非参与性保护基团-3个捐助者。进一步证明,当耐受武装和解除武装的保护基团时,硫代糖苷/苯磺酰基三氟甲磺酸酯的活化适用于葡糖苷系列。