Novel Route toL-Hexoses fromL-Ascorbic Acid: Asymmetric Synthesis ofL-Galactopyranose andL-Talopyranose Preliminary Communication
作者:Ludmila Ermolenko、N. André Sasaki、Pierre Potier
DOI:10.1002/hlca.200390302
日期:2003.11
A novel route with L-ascorbic acid as a single common starting material to asymmetric synthesis of all eight diastereomers of L-hexoses is described. Assessment of this new approach is demonstrated by the expedient synthesis of L-galactopyranose and L-talopyranose derivatives. Key steps involve stereoselective preparation of chiral (E)- and (Z)-γ-hydroxy-α,β-unsaturated esters and their stereo-controlled
描述了一种以L-抗坏血酸为单一常见原料的不对称合成L-己糖的所有八个非对映异构体的新途径。L-半乳糖吡喃糖和L-talopyranose衍生物的方便合成证明了对这种新方法的评估。关键步骤包括立体选择制备手性(E)-和(Z)-γ-羟基-α,β-不饱和酯,以及通过OsO 4进行立体控制的二羟基化。