Michael Reaction of Stabilized Carbon Nucleophiles Catalyzed by [RuH<sub>2</sub>(PPh<sub>3</sub>)<sub>4</sub>]
作者:Enrique Gómez-Bengoa、Juan M. Cuerva、Cristina Mateo、Antonio M. Echavarren
DOI:10.1021/ja961373w
日期:1996.1.1
also observed as side reactions. Catalysis by other ruthenium and rhodium complexes has been examined. Selectivity studies performed with malonate and disulfone donors indicate that the catalyst selectively activates Michael donors that can coordinate with ruthenium(II). Additionally, it has been shown that the reaction requires the presence of free phosphine. Therefore, the Michael reaction of stabilized
缺乏氰基的活性亚甲基化合物如丙二酸酯、β-酮酯、1,3-二酮、1,1-二砜、硝基化合物、Meldrum 酸和蒽酮与常见受体的迈克尔反应在乙腈溶液中在 [RuH2 (PPh3)4]作为催化剂。氰基乙酸盐在有机溶剂中比丙二酸盐酸性更强,也是该反应的极好底物。在许多情况下,也观察到由 [RuH2(PPh3)4] 催化的分子内羟醛反应作为副反应。已经研究了其他钌和铑配合物的催化作用。对丙二酸和二砜供体进行的选择性研究表明,该催化剂选择性地激活可以与钌 (II) 配位的迈克尔供体。此外,已经表明该反应需要存在游离膦。所以,稳定的烯醇化物的迈克尔反应似乎是钌和膦催化的反应。从实用的角度来看,使用随手准备...
Ionic Liquid as Catalyst and Reaction Medium. The Dramatic Influence of a Task-Specific Ionic Liquid, [bmIm]OH, in Michael Addition of Active Methylene Compounds to Conjugated Ketones, Carboxylic Esters, and Nitriles
作者:Brindaban C. Ranu、Subhash Banerjee
DOI:10.1021/ol051004h
日期:2005.7.1
[reaction: see text] A task-specific ionicliquid, [bmIm]OH, has been introduced as a catalyst and as a reactionmedium in Michael addition. Very interestingly, although the addition to alpha,beta-unsaturated ketones proceeds in the usual way, giving the monoaddition products, this ionicliquid always drives the reaction of open-chain 1,3-dicarbonyl compounds with alpha,beta-unsaturated esters and
Ionic liquid as catalyst and solvent: the remarkable effect of a basic ionic liquid, [bmIm]OH on Michael addition and alkylation of active methylene compounds
作者:Brindaban C. Ranu、Subhash Banerjee、Ranjan Jana
DOI:10.1016/j.tet.2006.10.077
日期:2007.1
ketones, carboxylic esters and nitriles. It further catalyzes the addition of thiols to α,β-acetylenic ketones and alkylation of 1,3-dicarbonyl and -dicyano compounds. The Michael addition to α,β-unsaturated ketones proceeds in the usual way, giving the monoaddition products, whereas addition to α,β-unsaturated esters and nitriles leads exclusively to the bis-addition products. The α,β-acetylenic ketones