Asymmetric Synthesis of α,α-Difluoro-β-amino Acid Derivatives from Enantiomerically Pure <i>N-tert-</i>Butylsulfinimines
作者:Donnette D. Staas、Kelly L. Savage、Carl F. Homnick、Nancy N. Tsou、Richard G. Ball
DOI:10.1021/jo0259313
日期:2002.11.1
reagent derived from ethyl bromodifluoroacetate to alkyl- and aryl-substituted N-tert-butylsulfinimines furnishes beta-tert-butylsulfinamyl-beta-substituted alpha,alpha-difluoroproponiates in diastereomeric ratios ranging from 80:20 to 95:5. The diastereomers are easily separated and the enantiomerically pure, protected beta-amino esters are readily transformed to the corresponding acid, amide, and amine
将衍生自溴二氟乙酸乙酯的Reformatsky试剂添加到烷基和芳基取代的N-叔丁基亚磺酰亚胺中,可以提供非对映异构体比例为80:20至95:5的β-叔丁基亚磺酰基-β取代的α,α-二氟丙酸酯。非对映异构体易于分离,对映体纯的,受保护的β-氨基酯很容易转化为相应的酸,酰胺和胺衍生物,可作为药物化学目标的有用合成子。