Chiral 1,2-diaminocyclohexane as organocatalyst for enantioselective aldol reaction
作者:Yi Liu、Junfeng Wang、Qi Sun、Runtao Li
DOI:10.1016/j.tetlet.2011.04.116
日期:2011.7
catalyze the asymmetric aldolreaction in MeOH–H2O. Cyclic ketones as aldol substrates gave the anti-β-hydroxyketone products with moderate to good yields, diastereoselectivity and enantioselectivity (up to 78% yield, >20:1 anti/syn, 94% ee). Hydroxyacetone as aldol substrate afforded the syn-α, β-dihydroxyketones as major products in up to 85% yield with good enantioselectivity (up to >20:1 syn/anti
一个简单的和可商购的手性1,2-二氨基环己烷作为催化剂,己二酸作为助催化剂能有效地催化在MeOH-H不对称醛醇缩合反应2 O.环酮类如醇醛底物,得到反-β-羟基酮产品具有中度至良好的收率,非对映选择性和对映选择性(高达78%的收率,抗/顺式> 20:1,94%ee)。羟丙酮作为醇醛底物以主要产物顺-α,β-二羟基酮的形式提供了高达85%的收率和良好的对映选择性(高达> 20:1 syn / anti,93%ee)。
Ionic liquid as a recyclable and efficient medium for lipase-catalyzed asymmetric cross aldol reaction
from porcine pancreas) was found to catalyze asymmetric cross aldolreactions of aromatic and heteroaromatic aldehydes with various ketones in ionicliquid ([BMIM][PF6]) for the first time. Interestingly, PPL exhibited high catalytic activity and excellent stereoselectivity in this efficient and recyclable room temperature ionicliquid in the presence of moderate water, similar to the results obtained
Enantioselective synthesis of β-hydroxy ketones from heterocyclic aldehydes in water catalyzed by a recyclable organocatalyst bearing an ionic liquid moiety
作者:D. E. Siyutkin、A. S. Kucherenko、S. G. Zlotin
DOI:10.1007/s11172-009-0258-1
日期:2009.9
The aldol reactions of cyclic (heterocyclic) ketones and heterocyclic aldehydes catalyzed by (4R,S)-4-hydroxyproline modified with a ionicliquid moiety proceed with high yields and diastereo- and enantioselectivity in the presence of water. The catalyst retained its activity and selectivity for at least five cycles.
Biocatalytic asymmetric aldol reaction in buffer solution
作者:Zong-Bo Xie、Na Wang、Guo-Fang Jiang、Xiao-Qi Yu
DOI:10.1016/j.tetlet.2012.12.022
日期:2013.2
A green and convenient protocol has been developed for asymmetric cross-aldol reaction. In this Letter, bovine pancreatic lipase (BPL) was first reported to catalyze the aldol reaction and acidic buffer was first used for promiscuous enzymatic aldol reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Water promoted enantioselective aldol Reaction by proline-cholesterol and -diosgenin based amphiphilic organocatalysts
A series of proline-cholesterol and -diosgenin based amphiphilic organocatalysts were developed for the first time, and their catalytic activities for the enantioselective aldol reaction were investigated. The results indicated that water can significantly enhance the activity and stereoselectivity of the transformation via micelle formation. TEM and AFM analysis demonstrated that the diameter of the micelle particles ranged from 200 to 800 nm. (C) 2013 Elsevier Ltd. All rights reserved.