Asymmetric Induction Reactions. VI. Asymmetric Synthesis of a Cyclopentene Derivative by Transition Metal-Catalyzed Asymmetric Vinylcyclopropane-Cyclopentene Rearrangements with Chiral Phosphine Ligands.
A Highly Efficient and Broadly Applicable Cationic Gold Catalyst
作者:Deepika Malhotra、Mark S. Mashuta、Gerald B. Hammond、Bo Xu
DOI:10.1002/anie.201310239
日期:2014.4.22
Goldcatalysts capable of promoting reactions at low‐level loadings under mild conditions are the exception rather than the norm. We examined reactions where the regeneration of cationicgoldcatalyst (e.g., protodeauration) was the turnover limiting stage. By manipulating electron density on the substituents around phosphorus and introducing steric handles we designed a phosphine ligand that contains
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.