Amino Acid-Catalyzed Asymmetric Carbohydrate Formation: Organocatalytic One-StepDe Novo Synthesis of Keto and Amino Sugars
作者:Ismail Ibrahem、Weibiao Zou、Yongmei Xu、Armando Córdova
DOI:10.1002/adsc.200505323
日期:2006.1
A direct de novo synthesis of ketoses and amino sugars by amino acid-catalyzed asymmetric aldol, Mannich and Michael reactions with dihydroxyacetone phosphate mimics as donors is presented. Proline, proline derivatives and thiazolidine-4-carboxylic acids catalyzed the asymmetric assembly of keto sugars and amino sugars in high yield with up to >99% ee. The organocatalytic C3+Cn methodology presented
提出了由氨基酸催化的不对称醛醇,曼尼希和迈克尔反应与二羟基丙酮磷酸酯模拟物作为供体的酮糖和氨基糖的直接从头合成。脯氨酸,脯氨酸衍生物和噻唑烷-4-羧酸以高达99%ee的高收率催化了酮糖和氨基糖的不对称组装。本文介绍的有机催化C 3 + C n方法是直接合成正交保护的C 4,C 5和C 6的从头合成酮糖,碳水化合物衍生物,氨基和氮杂糖以及聚草酰胺酸的总合成。添加水显着促进并改善了脯氨酸介导的仿生不对称CC键形成反应的对映选择性。