Asymmetric Induction Reactions. VI. Asymmetric Synthesis of a Cyclopentene Derivative by Transition Metal-Catalyzed Asymmetric Vinylcyclopropane-Cyclopentene Rearrangements with Chiral Phosphine Ligands.
作者:Kunio HIROI、Yoshihisa ARINAGA、Takashi OGINO
DOI:10.1248/cpb.42.470
日期:——
Asymmetric synthesis of a cyclopentene derivative was accomplished by transition metal-catalyzed vinylcyclopropane-cyclopentene rearrangements with chiral phosphine ligands. A dramatic solvent effect was observed on the nickel-catalyzed asymmetric rearrangement of a cyclopropane system into an optically active cyclopentene derivative with chiral phosphine ligands. The absolute configuration of the product was determined by chemical correlation to the compound of known absolute configuration. The stereochemistry of the product was readly controlled by selecting the catalyst, nickel or palladium, with extremely high enantioselectivity.
通过过渡
金属催化的
乙烯基环丙烷-
环戊烯重排,并使用手性
膦配体,实现了
环戊烯衍
生物的不对称合成。在
镍催化的
环丙烷系统不对称重排中,使用手性
膦配体,观察到溶剂效应对光学活性
环戊烯衍
生物的影响。通过已知绝对构象化合物的
化学相关性,确定了产物的绝对构象。通过选择催化剂(
镍或
钯),可以控制产物的立体
化学,并具有极高的对映选择性。