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
Brønsted Acid-Catalyzed Mannich-Type Reactions in Aqueous Media
aldimines took place smoothly in aqueous organic solvent to afford β-aminocarbonyl compounds in high yields. The HBF4-catalyzed Mannich-type reaction also proceeded smoothly in water without organic solvent in the presence of a surfactant. A three-component synthesis starting from aldehyde, amine, and silyl enolate was successfully realized by means of a Bronsted acid in aqueous media.
Brønsted acidic ionic liquids of aza-crown ether complex cations: preparation and applications in organic reactions
作者:Chen Cheng、Huanwang Jing
DOI:10.1039/c4ra03061c
日期:——
of an aza-crownether chelated potassium cation and various anions, were designed, synthesized and characterised by FTIR, NMR and mass spectrometry, thermogravimetric differential thermal analysis (TG-DTA) and elemental analysis. These new Brønsted acidic ionic liquids of aza-crownether complex cations (aCBAILs) were applied as catalysts to the Biginelli reaction, Mannich reaction and synthesis of
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%).
Highly Efficient Fe(HSO<sub>4</sub>)<sub>3</sub>-Catalyzed One-Pot Mannich-Type Reactions: Three Component Synthesis of β-amino Carbonyl Compounds
作者:Hossein Eshghi、Afsaneh Alipour、Saman Damavandi
DOI:10.1080/15533174.2011.555858
日期:2011.4.11
Fe(HSO4)3-catalyzed three-component one-pot Mannich reaction of acetophenone with different aromatic aldehydes and aromatic amines in ethanol at ambient temperature afforded the corresponding -aminocarbonyl compounds in very good to excellent yields. Short reaction time, excellent yield, easy work-up procedure, applicability of using various amines and aldehydes, capability of conversion of ortho-substituted