Abstract
Methyl α-D-glucopyranoside is converted to methyl 6-p-toluenesulfonyl-2,3,4-tris-O-trimethylsilyl- α-D-glucopyranoside 2 and then reacted with lithium diphenylphosphide in THF. When the reaction is carried out at room tem perature and below, S-O cleavage dominates giving methyl 2,3,4-tris-O-trimethylsilyl-α-D-glucopyranoside 3 , whereas at 60°C in THF or at 35°C in diethyl ether, C-O cleavage occurs yielding the title carbohydrate-phosphine 4 in good yield after deprotection
甲基α-D-葡萄糖吡喃糖苷被转化为甲基6-对甲苯磺酰基-2,3,4-三-O-三甲基硅基-α-D-葡萄糖吡喃糖苷2,然后在THF中与二苯基膦锂反应。当反应在室温及以下进行时,S-O裂解占主导地位,产生甲基2,3,4-三-O-三甲基硅基-α-D-葡萄糖吡喃糖苷3,而在THF中60°C或在乙醚中35°C时,发生C-O裂解,产生标题碳水化合物膦4,经去保护后收率良好。