An Extremely Efficient Three-Component Reaction of Aldehydes/Ketones, Amines, and Phosphites (Kabachnik−Fields Reaction) for the Synthesis of α-Aminophosphonates Catalyzed by Magnesium Perchlorate
作者:Srikant Bhagat、Asit K. Chakraborti
DOI:10.1021/jo062140i
日期:2007.2.1
an extremely efficient catalyst for the synthesis of α-aminophosphonates. A three-component reaction (3-CR) of an amine, an aldehyde or a ketone, and a di-/trialkyl phosphite (Kabachnik−Fields reaction) took place in one pot under solvent-free conditions to afford the corresponding α-aminophosphonates in high yields and short times. The use of solvent retards the rate of the reaction and requires a
A green one-pot three-component synthesis of α-aminophosphonates under solvent-free conditions and ultrasonic irradiation using Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-imid-PMA<sup>n</sup> as magnetic catalyst
GRAPHICAL ABSTRACT ABSTRACT An efficient and environment friendly process for the synthesis of α-aminophosphonates has been devised. Through a one-potthree-component condensation of various aldehydes, amines, and triethyl phosphite in the presence of Fe3O4@SiO2-imid-PMAn nanoparticles as magnetic catalysts under solvent-free conditions and ultrasonic irradiation, α-aminophosphonates were obtained
图形摘要 摘要 已设计出一种高效且环境友好的合成 α-氨基膦酸酯的方法。在Fe3O4@SiO2-imid-PMAn纳米粒子作为磁性催化剂存在下,在无溶剂条件和超声波照射下,通过各种醛、胺和亚磷酸三乙酯的一锅三组分缩合反应,以优异的收率获得了α-氨基膦酸酯. 将室温下无溶剂条件下的反应与超声辅助反应进行了比较。这种新方法具有显着的优点,例如反应时间短、收率高、易于纯化以及无需任何繁琐的后处理或纯化。上述催化剂可以很容易地通过外部磁场回收,并且可以重复使用六个连续的反应循环而不会显着损失活性。此外,还研究了反应循环后催化剂的 SEM 和 DLS。
Magnetic nanoparticles coated by acidic functionalized poly(amidoamine) dendrimer: Effective acidic organocatalyst
A novel magnetic BrOnsted acid catalyst was synthesized based on growing poly(amidoamine) dendrimers on the surface of magnetic nanoparticles. After the dendronizing process, the MNP coated PAMAM was functionalized by chlorosulfuric acid to form an acid catalyst. Because of dendrimer coating of MNPs, catalyst shows good loading level of acidic groups on the surface. Also zwitterion nature of catalyst surface improves the catalytic activity. This new catalyst is proven to be highly effective in the synthesis of alpha-aminophosphonate compounds in a green way. (C) 2012 Elsevier B.V. All rights reserved.