Enantioselective alkynylation of aldehydes catalyzed by a camphor sulfonylated amino alcohols titanium(IV) catalyst system
作者:Shaohua Gou、Zhongbin Ye、Zhiyu Huang、Xiping Ma
DOI:10.1002/aoc.1622
日期:——
β‐unsaturated aldehydes were found to be suitable substrates in the presence of the camphor sulfonylated amino alcohol titanium(IV) complex [10 mol% 1h, 40 mol% Ti(i‐OPr)4]. The desired propargylic alcohols were afforded with high isolated yields (up to 90%) and moderate enantioselectivities (up to 65% ee) under mild conditions. Copyright © 2010 John Wiley & Sons, Ltd.
已经开发出一种新的钛(IV)配合物,用于将苯乙炔加成醛的有效对映选择性炔基化反应。钛(IV)配合物易于从(R)-C-(7,7-二甲基-2-氧代双环[2.2.1]庚-1-基)-(1 R,2 S)-原位制备N-(2-羟基-1,2-二苯基乙基)-甲磺酰胺(1h)和钛酸四异丙酯[Ti(i- OPr)4 ]。在樟脑磺酰化氨基醇钛(IV)络合物[10摩尔%1h,40摩尔%Ti(i- OPr)4的存在下,发现各种芳香醛和α,β-不饱和醛是合适的底物。]。在温和条件下,所需的炔丙醇具有较高的分离收率(最高90%)和中等的对映选择性(最高65%ee)。版权所有©2010 John Wiley&Sons,Ltd.