Cycloadditions of chiral carbonyl ylides with imine dipolarophiles as a route to enantiomerically pure α-amino-β-hydroxy acids
作者:Yu Gan、Laurence M. Harwood、Simon C. Richards、Ian E.D. Smith、Victoria Vinader
DOI:10.1016/j.tetasy.2009.02.029
日期:2009.5
The preparation of enantiomerically pure threo-β-amino-α-hydroxy acids via 1,3-dipolar cycloadditions of imine dipolarophiles with the chiral isomünchnone derived from (5R)-5-phenylmorpholin-3-one 1 is described. The cycloadducts were obtained with excellent diastereofacial- and exo-selectivity. Subsequent hydrolysis and chemoselective exocyclic amide cleavage afforded the threo-β-amino-α-hydroxy acids
描述了通过亚胺二极性亲和剂与衍生自(5 R)-5-苯基吗啉-3-酮1的手性异喹酮的1,3-偶极环加成反应制备对映体纯的苏-β-氨基-α-羟基酸。获得具有优异的非对映选择性和外向选择性的环加合物。随后的水解和化学选择性的环外酰胺裂解提供了苏-β-氨基-α-羟基酸,并回收了最初的手性助剂。