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
<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.
A new high-yielding method for the preparation of 2-alkyl- and 1,2-dialkyl-4-nitro-5-bromoimidazoles
作者:A. K. S. Bhujanga Rao、C. Gundu Rao、B. B. Singh
DOI:10.1021/jo00037a051
日期:1992.5
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.
Synthesis and antimicrobial activities of some 3-arylamino-5-[2-(substituted 1-imidazolyl)ethyl]-1,2,4-triazole derivatives
作者:Şeref Demirayak、Kadriye Benkli、Kıymet Güven
DOI:10.1016/s0223-5234(00)01178-8
日期:2000.11
3-arylamino-5-[2-(substituted imidazol-1-yl or benzimidazol-1-yl)ethyl]-1,2,4-triazole derivatives were synthesised by reacting 3-(substituted imidazol-1-yl)propionyl hydrazides, with S-methyl-N'-arylisothiouronium iodide salts. Their structures were elucidated by IR, 1H-NMR and mass spectroscopic data and elemental analyses results. Antimicrobialactivities of the compounds were observed against Staphylococcus