Organocatalytic<i>syn</i>-Aldol Reactions of Hydroxy Ketones with (<i>S</i>)-Isoserinal: Asymmetric Synthesis of 6-Deoxy-1,5-iminohexitols and Related Compounds
作者:Cyril Nicolas、Roman Pluta、Monika Pasternak-Suder、Olivier R. Martin、Jacek Mlynarski
DOI:10.1002/ejoc.201201413
日期:2013.3
intermediate was reacted through organocatalyzed aldol reaction or Wittig based chain extension and functionalization to give enantiopure 1,5,6-trideoxy-1,5-imino-hexitols such as 10a (L-manno) and 10b (D-gluco). These two compounds are of interest as glycosidase inhibitors. The elaborated organocatalytic process includes diastereoselective syn aldol reaction of (S)-isoserinal hydrate and hydroxyacetone or
报道了一种改进且方便的大规模保护 (S)-异丝氨酸制备方法。该关键中间体通过有机催化的羟醛反应或基于 Wittig 的扩链和官能化反应,得到对映体纯的 1,5,6-trideoxy-1,5-imino-hexitols,如 10a (L-manno) 和 10b (D-gluco)。这两种化合物可用作糖苷酶抑制剂。精心设计的有机催化过程包括 (S)-异丝氨酸水合物与羟基丙酮或 1-羟基-2-辛酮的非对映选择性合成羟醛反应,并由各种基于氨基酸的催化剂促进。实现了高达 8:1 的非对映选择性,从而为这些重要的碳水化合物模拟物建立了一条新的、有效的合成路线。