An efficient method for the synthesis of 1-thio-β-mannopyranosides is reported. This method employs the simple, easy-to-make 2,3,4,6-tetra-O-acetyl-1-S-acetyl-1-thio-β-D-mannopyranose as starting material to conduct an in situ selective de-S-acetylation, and subsequent SN2 reaction with an acceptor bearing a leaving group. The high nucleophilicity and slow anomerization of the intermediate thiol allows the synthesis of 1-thio-β-mannopyranosides in a simple and practical manner.
报告了一种合成 1-
硫代-δ-
吡喃
甘露糖苷的高效方法。该方法采用简单易制的 2,3,4,6-四-O-
乙酰基-1-S-
乙酰基-1-
硫代-δ-D-
吡喃
甘露糖作为起始原料,进行原位选择性去 S-乙酰化,随后与带有离去基团的受体发生 SN2 反应。中间
硫醇的亲核性强,异构化速度慢,因此能以简单实用的方式合成 1-
硫代-δ-D-
吡喃
甘露糖苷。