An efficient approach to partially O-methylated α-D-mannopyranosides using bis-tert-butyldiphenylsilyl ethers as intermediates
作者:MaSelma Arias-Pérez、MaJesús Santos
DOI:10.1016/0040-4020(96)00600-x
日期:1996.8
Differential migratory aptitudes of secondary tert-butyldiphenylsilyl (TBDPS) groups have been observed for the bis-silylated derivatives of methyl and allyl α-D-mannopyranosides under several basic media. A remarkable variation of the selectivity in the migration of the TBDPS group at position 3 (O-3 → O-2 versus O-3 → O-4) was found by changing the hardness of the base and reaction conditions. This
在几种基本介质下,已观察到仲叔丁基二苯基甲硅烷基(TBDPS)的甲基和烯丙基α-D-甘露吡喃糖苷的双甲硅烷基化衍生物具有不同的迁移能力。通过改变碱的硬度和反应条件,发现TBDPS基团在位置3迁移的选择性有显着变化(O-3→O-2对O-3→O-4)。此行为是针对3,6-,2,6-和4,6-双-TBDPS醚3-5a,b(用于制备其他O取代的衍生物的通用中间体)的实际合成。它们成功地转化为甲基和烯丙基的2,4-,3,4-和2,3-二-O-甲基α-D-甘露吡喃糖苷(10-12a,b)。