Unprecedented Effects of Additives and Ligand-to-Metal Ratio on the Enantiofacial Selection of Copper-Catalyzed Alkynylation of α-Imino Ester with Arylacetylenes
作者:Zhihui Shao、Jun Wang、Kai Ding、Albert S. C. Chan
DOI:10.1002/adsc.200700237
日期:2007.10.8
The first catalytic asymmetric addition of arylacetylenes to α-imino esters was carried out using chiral copper(I) complexes as catalysts under mild reaction conditions, providing the corresponding alkynylation products in good yields with 67–74 % ee values. Profound effects of the ligand-to-metal ratio and additives on the stereofacial selection were observed. Both enantiomers of a given product can
使用手性铜(I)配合物作为催化剂,在温和的反应条件下,将芳基乙炔首次催化不对称加成到α-亚氨基酯上,从而以67-74%ee值提供了具有良好收率的相应炔基化产物。观察到配体与金属之比和添加剂对立体选择的深刻影响。可以通过调节配体与金属的比例,使用相同的手性配体,以几乎相同的对映体过量获得给定产物的两种对映体。