A Highly Efficient Large-Scale Asymmetric Direct Intermolecular Aldol Reaction Employing L-Prolinamide as a Recoverable Catalyst
作者:Yang Yang、Yan-Hong He、Zhi Guan、Wei-Da Huang
DOI:10.1002/adsc.201000355
日期:2010.10.4
A new, simple bifunctional, recoverable and reusable L-prolinamide organocatalyst that promotes aldol reactions while achieving a respectable level of enantioselectivity is reported. This organocatalyst is applicable to the reactions of a wide range of aromatic and heteroaromatic aldehydes with cyclic and acyclic ketones, and the anti-aldol products could be obtained with up to 99:1 anti/syn ratio
报道了一种新型的,简单的双功能,可回收和可重复使用的L-脯氨酰胺有机催化剂,该催化剂可促进醛醇缩合反应,同时达到可观的对映选择性。该有机催化剂适用于多种芳族和杂芳族醛与环状和无环酮的反应,可以以高达99:1的抗/合成比和98%ee的抗醛产物获得。该催化剂可以容易地回收和再利用,并且在五个循环中仅观察到对映选择性的轻微降低。该新型催化剂可以有效地用于大规模反应,同时将对映选择性保持在同一水平,这为工业应用提供了很大的可能性。