The key chiral synthon in a novel synthesis of (-)-allo-muscarine from D-glucose has been prepared by three independent routes. The most efficient one includes a four-step conversion via the 4-O-benzoyl derivatives of starting 2,5-anhydro-3,5-di-O-methanesulfonyl-L-idose ethylene acetal (2a) into 2,5-anhydro-3,6-dideoxy-L-lyxo-hexose ethylene acetal (4b). The intermediate 4b was efficiently converted into the chiral synthon 2,5-anhydro-4-O-benzoyl-3,6-dideoxy-L-arabino-hexose (4c) by Mitsunobu reaction.
一项新的从
D-葡萄糖合成(-)-
allo-肌碱的方法中,关键的手性合成单体已经通过三种独立的途径制备而成。其中最有效的方法包括通过四步反应将起始物2,5-去氧-3,5-二-
O-甲磺酰-L-异
吡喃
乙二醇 (
2a)的4-
O-苯甲酰衍
生物转化为2,5-去氧-3,6-二脱氧-L-
lyxo-己糖
乙二醇 (
4b)。中间体
4b经Mitsunobu反应有效地转化为手性合成单体2,5-去氧-4-
O-苯甲酰-3,6-二脱氧-L-
arabino-己糖 (
4c)。