Enantiospecific synthesis of 2-amino-3-methyl-4-phosphonobutanoic acids via 14-addition of lithiated Schöllkopf anion to prop-2-enylphosphonates
作者:Vicente Ojea、María Ruiz、Gideon Shapiro、Esteban Pombo-Villar
DOI:10.1016/s0040-4039(00)76883-3
日期:1994.5
High diastereoselectivity in the conjugate addition of lithiated Schöllkopf's bislactim ethers to E- and Z- prop-2-enylphosphonates was utilized to achieve a direct asymmetric synthesis of all four diastereoisomers of 2-amino-3-methyl-4-phosphonobutanoic acid, i.e. (+)-(2S, 3R)-4a, (+)-(2S, 3S)-4b and their corresponding enantiomers. Their relative configuration was definitively assigned from an NMR
将锂化的Schöllkopf的双内酯醚共轭加成到E-和Z-丙-2-烯基膦酸酯中的非对映异构体选择性高,可实现2-氨基-3-甲基-4-膦酰基丁酸的所有四个非对映异构体的直接不对称合成,即( +)-(2 S,3 R)-4a,(+)-(2 S,3 S)-4b及其对应的对映异构体。根据两种非对映异构体的氧杂膦烷衍生物的NMR研究确定了它们的相对构型。