Direct Asymmetric Aldol Reactions Inspired by Two Types of Natural Aldolases: Water-Compatible Organocatalysts and Zn<sup>II</sup> Complexes
作者:Joanna Paradowska、Monika Pasternak、Bartosz Gut、Beata Gryzło、Jacek Mlynarski
DOI:10.1021/jo201584w
日期:2012.1.6
water-compatible amino-acid-based catalysts was explored in the development of diastereo- and enantioselective direct aldol reactions of a broad range of substrates. Chiral C2-symmetrical proline- and valine-based amides and their ZnII complexes were designed for use as efficient and flexible chiral catalysts for enantioselective aldol reactions in water, on water, and in the presence of water. The presence of
在本文中,在开发多种底物的非对映和对映选择性直接羟醛反应中,探索了与水相容的氨基酸基催化剂的实用性。手性C 2对称的脯氨酸和缬氨酸基酰胺及其Zn II配合物被设计用作有效和灵活的手性催化剂,用于水,水和水存在下的对映选择性醛醇缩合反应。5 mol%的脯氨酰胺基催化剂的存在使未改性的酮与各种醛之间发生不对称的分子间羟醛反应,从而得到抗氧化剂。具有优异对映选择性的产品。我们还证明了对水具有较高亲和力的要求更高的底物(如丙酮和甲醛)的醛醇缩合反应。新设计的基于丝氨酸的有机催化剂促进了羟丙酮的醛醇缩合反应,生成了顺式二醇。对于提出的催化体系,无溶剂的条件也是可以接受的,这使得从绿色化学的角度出发,详细的方法变得很有趣。