PPh3 was used as an efficient catalyst for the one-pot three-component Mannich reactions of acetophenone with different aromatic amines and aromatic aldehydes under solvent-free conditions at room temperature. This method provides a novel and improved method for preparing β-amino carbonyl compounds in the absence of acidic catalyst in excellent yield. Little catalyst loading, easy accessibility of the catalyst, mild conditions, and simple work-up procedure are the main features of this protocol.
Reusable 1,2,4-Triazolium Based Brønsted Acidic Room Temperature Ionic Liquids as Catalyst for Mannich Base Reaction
作者:Sankaranarayanan Nagarajan、Elango Kandasamy
DOI:10.1007/s10562-014-1312-7
日期:2014.9
Unprecedented examples of 1-alkyl-1,2,4-triazolium methanesulfonate based Brønsted acidic room temperature ionicliquids were synthesized and characterized. Their catalytic activity and efficiency in recyclability and reusability on one pot synthesis of halide substituted β-amino carbonyl compounds are reported.Graphical Abstract
Efficient synthesis of
<i>β</i>
‐aminoketones catalyzed by Fe
<sub>3</sub>
O
<sub>4</sub>
@ quillaja sapogenin/Ni (II) as a novel magnetic nano‐catalyst
infrared (FT‐IR) spectroscopy, inductively coupled plasma (ICP), X‐ray diffraction (XRD) and scanning electron microscopy (SEM). The achievements demonstrated that the proposed agents were beneficial to synthesis the derivatives of β‐aminoketone. Moreover, it was possible to recover the catalyst by means of simple magnetic decantation quickly. Besides, no reduction in the activity of the catalyst occurred
合成了一种新的纳米磁性核-壳Fe 3 O 4 @quillaja sapogenin / Ni(II),并通过包括能量分散X射线光谱法(EDS),Brunauer-Emmett-Teller(BET),热分析的各种测试进行了全面表征重力分析(TGA),高分辨率透射电子显微镜(HR‐TEM),振动样品磁力计(VSM),傅里叶变换红外(FT‐IR)光谱,电感耦合等离子体(ICP),X射线衍射(XRD)和扫描电子显微镜(SEM)。研究结果表明,所提出的试剂有利于合成β的衍生物。氨基酮 而且,可以通过简单的磁性倾析快速地回收催化剂。此外,即使被用于各种反应中,也没有降低催化剂的活性。
Fe3O4@saponin/Cd: a novel magnetic nano-catalyst for the synthesis of β-aminoketone derivatives
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