Catalytic Enantioselective Addition of Propionate Units to Imines: An Efficient Synthesis of anti--Methyl--Amino Acid Derivatives
作者:Shū Kobayashi、Jun Kobayashi、Haruro Ishiani、Masaharu Ueno
DOI:10.1002/1521-3765(20020916)8:18<4185::aid-chem4185>3.0.co;2-6
日期:2002.9.16
catalytic enantioselective addition of propionate units to simple and inert imines using a chiral zirconium complex. High reactivity and selectivity with wide substrate scope were attained by using a new chiral ligand, (R)-6,6'-bis(pentafluoroethyl)-1,1'-bi-2-naphthol ((R)-6,6'-C(2)F(5)BINOL). The reactions using geometrically isomeric ketene silyl acetals gave excellent anti-selectivity with high enantiomeric
光学活性的抗α-甲基-β-氨基酸衍生物是基于使用手性锆配合物将丙酸酯单元催化对映选择性加成至简单和惰性亚胺而制备的。通过使用新的手性配体(R)-6,6'-双(五氟乙基)-1,1'-bi-2-萘酚((R)-6,6' -C(2)F(5)BINOL)。在两种情况下,使用几何异构体乙烯酮甲硅烷基缩醛进行的反应均具有出色的抗选择性和高对映体过量。通过制备各种抗α-甲基-β-氨基酸和反式3,4-二取代的β-内酰胺衍生物已经证明了该反应的合成效用。