Highly Efficient Direct Asymmetric Aldol Reactions Catalyzed by a Prolinethioamide Derivative in Aqueous Media
作者:Bing Wang、Xin-wang Liu、Ling-yan Liu、Wei-xing Chang、Jing Li
DOI:10.1002/ejoc.201001115
日期:2010.11
acids L-proline and L-valine, was studied for the direct asymmetric aldol reaction of acetone with various aromatic aldehydes at 0 °C or room temperature. A loading of only 0.1―0.2 mol-% of derivative 1c was employed in this catalytic system, and excellent enantio-selectivities and yields (up to 98 % yield, >99 % ee) could be achieved in aqueous media.
L-脯氨酸硫代酰胺衍生物 1c 由易得的天然氨基酸 L-脯氨酸和 L-缬氨酸制备,研究了丙酮与各种芳香醛在 0°C 或室温下的直接不对称醛醇反应。在该催化体系中仅使用了 0.1-0.2 mol-% 的衍生物 1c,并且在水性介质中可以实现出色的对映选择性和产率(高达 98% 的产率,>99% ee)。