Studies on β-lactam antibiotics. Synthesis and antibacterial activity of novel 1β-methylcarbapenems related to FR21818: 5-membered ring analogs
摘要:
The synthesis and biological activity of the novel series of 1 beta-methylcarbapenems 1 are described. Most compounds displayed extremely potent antibacterial activity and high renal DHP-1 stability. The best compound in this series, FR21818 (1a) displayed excellent in vivo efficacy against an MRSA infection in mice. (C) 1997 Elsevier Science Ltd.
Highly efficient aza-Michael reactions of aromatic amines and N-heterocycles catalyzed by a basic ionic liquid under solvent-free conditions
作者:Lei Yang、Li-Wen Xu、Wei Zhou、Lyi Li、Chun-Gu Xia
DOI:10.1016/j.tetlet.2006.08.103
日期:2006.10
A task-specific basic ionicliquid, [Bmim]OH, has been introduced as a catalyst for the aza-Michaeladdition of aromaticamines and N-heterocycles to cyclic or acyclic ketones under neat conditions. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency.
Guanidine-based task-specific ionic liquids as catalysts for aza-Michael addition under solvent-free conditions
作者:Anguo Ying、Ming Zheng、Haidan Xu、Fangli Qiu、Changhua Ge
DOI:10.1007/s11164-011-0296-9
日期:2011.10
An efficient and facile protocol for aza-Michaeladdition of aliphatic and aromaticamines to electron-deficit alkenes using [TMG][Lac] as catalyst under solvent-free conditions was established.
Aza-Michael addition of aliphatic or aromatic amines to α,β-unsaturated compounds catalyzed by a DBU-derived ionic liquid under solvent-free conditions
作者:An-Guo Ying、Luo Liu、Guo-Feng Wu、Gang Chen、Xin-Zhi Chen、Wei-Dong Ye
DOI:10.1016/j.tetlet.2009.01.123
日期:2009.4
A task-specific ionicliquid, 1,8-diazabicyclo[5.4.0]-undec-7-en-8-ium acetate has been successfully used as a catalyst for aza-conjugate addition of aliphatic or aromaticamines to various electron deficient alkenes under solvent-free conditions and at room temperature. The catalyst can be reused for six times without noticeable loss of activity.
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
The completely solventfree as well as catalystfree aza‐Michael addition reaction of azoles to liquid Michael acceptors is studied. As long as the solubility of the azole in the reaction mixture is sufficient, the addition reaction proceeds towards completion in several hours at 80 °C as has been demonstrated with 12 examples.