that 2 a and 2 b were thermally stable at 300 and 180 °C, respectively. These complexes exhibited unusually high solubility in polar organicsolvents. Conductivity measurement showed that the complexes (2 a and 2 b) were ionic dissociation in CH3CN solution. X‐ray analysis result confirmed 2 a⋅3 H2O⋅THF was a cationic organometallic Lewis acid. UV/Vis spectra showed a significant red shift due to the
强路易斯酸空气中稳定的金属茂双(全氟辛烷磺酸盐)S [M(CP)2 ] [OSO 2 C ^ 8 ˚F 17 ] 2 ⋅ Ñ ħ 2 O⋅THF(M = Zr的(2 ⋅3ħ 2 O⋅THF ),M =的Ti(图2b ⋅2ħ 2 O⋅THF))由[M(CP)的反应合成2 ]氯2(M = Zr的(1),M =的Ti(图1b)),与n BuLi和C 8 F 17 SO 3 H(2当量)或与C 8 F 17 SO 3Ag(2当量)。这些配合物的水合物数(n)是可变的,取决于条件从0变为4。与众所周知的茂金属三氟甲磺酸盐相反,这些络合物在露天环境中一年没有变化。热重-差示扫描量热(TG-DSC)分析表明,2和图2b分别为300和180℃,是热稳定的。这些配合物在极性有机溶剂中显示出异常高的溶解度。电导率测量表明,络合物(2a和2b)在CH 3 CN溶液中呈离子离解。X射线分析结果确认为2 a⋅3H
An efficient and mild bismuth triflate-catalysed three-component Mannich-type reaction
作者:Thierry Ollevier、Etienne Nadeau
DOI:10.1039/b710794c
日期:——
In the presence of a catalytic amount of Bi(OTf)(3).4H(2)O, aldehydes together with amines react with silylenolates to afford the corresponding Mannich-type adducts smoothly. A wide variety of silylenolates derived from ketones, as well as esters and thioesters, react rapidly to afford the beta-amino ketones or the beta-amino esters in high yields (up to 94%).
Bismuth triflate catalyzes the Mannich-typereaction of a variety of in situ generated aldimines using aldehydes, anilines, and silyl enol ethers in a three-componentreaction. The reaction proceeds rapidly and affords the corresponding protected β-amino ketones in high yields (up to 94%).
Synthesis and structure of an air-stable organoantimony complex and its use as a catalyst for direct diastereoselective Mannich reactions in water
作者:Jun Xia、Renhua Qiu、Shuangfeng Yin、Xiaowen Zhang、Shenglian Luo、Chak-Tong Au、Kai Xia、Wai-Yeung Wong
DOI:10.1016/j.jorganchem.2010.03.003
日期:2010.5
An air-stable organoantimony complex with a 5,6,7,12-tetrahydrodibenzo[c,f][1,5]azastibocine framework was synthesized, characterized, and found to exhibit high catalytic efficiency towards one-pot Mannich reaction with high diastereoselectivity in water. The catalyst can be recycled 10 times without showing any appreciable loss of efficiency. This catalytic system affords a simple and efficient approach for the synthesis of beta-amino ketones. (C) 2010 Elsevier B.V. All rights reserved.
Synthesis and structure of an air-stable μ2-hydroxy-bridged binuclear complex of bis(methylcyclopentadienyl)dizirconium(IV) perfluorooctanesulfonate and its application in Lewis acid-catalyzed reactions
Air-stable binuclear complex of bis(methylcyclopentadienyl)zirconium perfluorooctanesulfonate (1a) was successfully synthesized by the reaction of (CH3Cp)2ZrCl2 with C8F17SO3Ag. The compound 1a was characterized by different techniques and found to have the nature of air-stability, water tolerance, thermally-stability and strong Lewis-acidity. In addition, its solubility was higher than that of our
通过(CH 3 Cp)2 ZrCl 2与C 8 F 17 SO 3 Ag反应成功地合成了双(甲基环戊二烯基)全氟辛烷磺酸锆(1a)的空气稳定双核络合物。化合物1a用不同的技术表征,发现具有空气稳定性,耐水性,热稳定性和强路易斯酸度的性质。此外,它的溶解度高于我们先前报道的单核锆茂双(全氟辛烷磺酸盐)的溶解度。它在烷基芳基醚的Friedel-Crafts酰化反应和Mannich反应中显示出很高的催化效率,可以重复使用。