A binary acid system has been developed that features an air‐stable organometallic precursor, titanocene dichloride, and simple organic cooperativeBrønstedacids, which allowed for mild and highly efficient Mannich reactions of both aryl and alkyl ketones with excellent yields and satisfactory diastereoselectivity. Mechanistic studies, including 1H NMR titration, X‐ray structure analyses as well as
已经开发了一种二元酸体系,其特征是具有空气稳定性的有机金属前体,二茂钛二氯化物和简单的有机协作布朗斯台德酸,可实现芳基和烷基酮的温和高效的曼尼希反应,并具有优异的收率和令人满意的非对映选择性。机理研究,包括1 H NMR滴定,X射线结构分析以及催化活性物质的分离,阐明了这种新的二元酸体系的巨大协同作用。
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
electron microscopy (HR-TEM), and Brunauer–Emmett–Teller (BET). It was found that the catalyst was active for the synthesis of β-aminoketone derivatives via one-pot three-component Mannich-type reactions of ketones, aromatic aldehydes, aromatic amines under eco-friendly solvent, at room temperature. Furthermore, this catalyst can be easily recovered magnetically and can be reused for other runs without any
One-pot, three-component Mannich-type reaction catalyzed by functionalized ionic liquid
作者:Dong Fang、Kai Gong、Dai-zhen Zhang、Zu-liang Liu
DOI:10.1007/s00706-009-0182-y
日期:2009.11
AbstractA three-componentMannich-typereaction of aromatic aldehydes, aromatic amines, and ketones was catalyzed by a novel functionalized ionic liquid, 3-(N,N-dimethyldodecylammonium)propanesulfonic acid hydrogen sulfate ([DDPA][HSO4]) at room temperature to give various β-amino carbonyl compounds in good yields. The catalyst could be reused at least six times without noticeably reducing catalytic
Abstract A highlyefficient clean and simple methodology has been established for the one-pot Mannichreaction using ionic liquid-immobilized proline(s) organocatalyst under solvent-free conditions. The three components comprising substituted acetophenones, substituted aromatic aldehydes and substituted aromatic amines underwent Mannichreactions in the presence of 7 mol% of ionic liquid-immobilized