Highly Enantioselective Addition of Phenylacetylene to Ketones Catalyzed by Bis(hydroxycamphorsulfonamide)-Copper(II) Complex
作者:Rui Wang、Lei Liu、Yong-Feng Kang、Hua-Qing Cai、Chao Chen
DOI:10.1055/s-2006-932473
日期:——
A chiral copper complex, generated from a C 2-symmetric bis(hydroxycamphorsulfonamide) ligand (8 mol%) and Cu(OTf)2, has been discovered to effect high enantioselectivities in the addition of alkynylzinc to a series of simple ketones. The alkynylation of a variety of aromatic and aliphatic ketones resulted in excellent yields and enantioselectivities (83-98% ee). Even when the loadings of the catalyst is 5 mol%, up to 94% ee was obtained.
一种由C2对称的双(羟基樟脑磺酰胺)配体(8摩尔%)和Cu(OTf)2生成的手性铜配合物,已被发现能显著提高烷炔基锌对一系列简单酮加成反应的立体选择性。对各种芳香族和脂肪族酮的炔基化反应,产率极高且具有优良的立体选择性(83-98% 对映体过量)。即使催化剂用量降至5摩尔%,也能获得高达94%的对映体过量。