A fast and highly efficient protocol for Michael addition of N-heterocycles to α,β-unsaturated compound using basic ionic liquid [bmIm]OH as catalyst and green solvent
作者:Jian-Ming Xu、Chao Qian、Bo-Kai Liu、Qi Wu、Xian-Fu Lin
DOI:10.1016/j.tet.2006.11.013
日期:2007.1
A fast and green protocol for the Michaeladdition of N-heterocycles to α,β-unsaturated compounds at room temperature was developed using a basic ionic liquid, 1-methyl-3-butylimidazolium hydroxide, [bmIm]OH, as a catalyst and a reaction medium. The reactions were performed at room temperature with good yields in short reaction times (0.5–3 h). This strategy is quite general and it works with a broad
Mild and Efficient Procedure for Michael Addition of N-Heterocycles to <font>α</font>,<font>β</font>-Unsaturated Compounds Using Anhydrous K<sub>3</sub>PO<sub>4</sub> as Catalyst
Imidazole, 1,2,4-triazole, indole, and benzotriazole undergo conjugate additions with , -unsaturated carbonyl compounds in the presence of anhydrous potassium phosphate at ambient temperature to afford the corresponding Michael adducts in excellent yields.
<i>N</i>-Methylimidazole as a Promising Catalyst for the Aza-Michael Addition Reaction of N-Heterocycles
作者:Xian Lin、Bo Liu、Qi Wu、Xue Qian、De Lv
DOI:10.1055/s-2007-983816
日期:2007.9
N-Methylimidazole has been shown to be a promising catalyst for aza-Michael reactions. Various N-heterocycles were introduced to α,β-unsaturated carbonyl compounds employing N-methylimidazole (0.05 equiv) in a highly efficient, rapid and high yielding synthesis of N-heterocyclic derivatives.
Various bi/tricyclic azole-thiazolines are obtained via a new one-pot protocol from cheap starting materials.
通过一种新的一锅法,可以从廉价的起始材料中获得各种双/三环唑-噻唑烯。
Promiscuous acylase-catalyzed aza-Michael additions of aromatic N-heterocycles in organic solvent
作者:Chao Qian、Jian-Ming Xu、Qi Wu、De-Shui Lv、Xian-Fu Lin
DOI:10.1016/j.tetlet.2007.06.164
日期:2007.8
A novel and efficient enzymatic promiscuous protocol for aza-Michael addition of aromatic N-heterocycles to alpha,beta-unsaturated compounds has been described. The reactions were catalyzed by promiscuous zinc-active-site acylase in organic solvent at 50 degrees C. The strategy works with a broad range of N-heterocycles to afford the corresponding Michael adduct with good yields in several hours (0.5-6 h). This catalytic promiscuity is the first example of metal-active-site enzyme-catalyzed aza-Michael addition for aromatic N-heterocycles. (c) 2007 Elsevier Ltd. All rights reserved.