Asymmetric Michael Addition of the<i>N</i>-Alkylidene Derivative of an α-Amino Ester to Methyl (<i>E</i>)-3-[(3<i>R</i>,7a<i>S</i>)-2-Phenylperhydropyrrolo[1,2-<i>c</i>]imidazol-3-yl]propenoate
作者:Hidetoshi Yamamoto、Shuji Kanemasa、Eiji Wada
DOI:10.1246/bcsj.64.2739
日期:1991.9
The exclusively diastereoselective asymmetric Michael addition of the lithiated methyl N-(2,2-dimethylpropylidene)glycinate to methyl (E)-3-[(3R,7aS)-2-phenylperhydropyrrolo[1,2-c]imidazol-3-yl]propenoate is described. The synperiplanar conformer of the acceptor propenoate participated in the reaction where the re-face of the acceptor molecule was attacked by the re(β)-face of the lithiated intermediate.
报道了锂化的甲基N-(2,2-二甲基丙叉)甘氨酸酯与甲基(E)-3-[(3R,7aS)-2-苯基全氢吡咯[1,2-c]咪唑-3-基]丙烯酸酯之间的专一性立体选择性不对称迈克尔加成反应。在这种反应中,受体的烯丙酸酯的同侧平伏构象参与反应,其中受体分子的re面被锂化中间体的re(β)面攻击。