Highly modular dipeptide-like organocatalysts for direct asymmetric aldol reactions in brine
作者:Xiao-Mu Hu、Dong-Xu Zhang、Sheng-Yong Zhang、Ping-An Wang
DOI:10.1039/c5ra07019h
日期:——
dipeptide-like organocatalysts derived from proline, amino acids and primary amines have been prepared for direct asymmetric aldol reactions between various aromatic aldehydes and acetone to afford aldol products in good yields (up to 82%) and moderate enantioselectivities (up to 67% ee) with only 1 mol% of catalyst-loading in brine. Under the same conditions, the direct asymmetric aldol reactions of aromatic
已经制备了一系列新的衍生自脯氨酸,氨基酸和伯胺的二肽样有机催化剂,用于各种芳族醛和丙酮之间的直接不对称羟醛反应,从而以良好的收率(最高82%)和中等的对映选择性(最高可达90%)提供羟醛产物。 67%ee),只有1 mol%的催化剂负载在盐水中。在相同条件下,芳族醛与环己酮的直接不对称羟醛反应可得到高收率(高达91%)和中等至良好的对映选择性(高达88%ee)和优异的非对映选择性(高达99%dr)的羟醛产物。这些有机催化剂很容易从市售材料中以多克规模合成,并在其结构和立体感方面具有高度的模块化。