Magnetically recyclable magnetite–ceria (Nanocat-Fe-Ce) nanocatalyst – applications in multicomponent reactions under benign conditions
作者:Manoj B. Gawande、Vasco D. B. Bonifácio、Rajender S. Varma、Isabel D. Nogueira、Nenad Bundaleski、C. Amjad A. Ghumman、Orlando M. N. D. Teodoro、Paula S. Branco
DOI:10.1039/c3gc40375k
日期:——
explored for the synthesis of dihydropyridines under benign conditions; a greener protocol is described that provides a simple and efficient method for the synthesis of functionalized 1,4-dihydropyridines using a recyclable nanocatalyst. Notably, 5.22 mol% of the catalyst is sufficient to catalyze the multicomponent reaction in ethanolic medium at room temperature. Importantly, the catalyst could be easily
Extremely facile and efficient procedures have been developed for the synthesis of highlyfunctionalizedpiperidines and dihydro-2-oxypyrroles via one-pot multi-component reactions in the presence of Al(H2PO4)3 as a heterogeneous and eco-friendly catalyst under mild conditions. The multi-component reaction of aromatic aldehydes, aromatic amines, and β-keto esters catalyzed by Al(H2PO4)3 in EtOH at room
在Al(H 2 PO 4)3作为非均相和生态友好型催化剂的存在下,通过单锅多组分反应合成高度官能化的哌啶和二氢-2-氧基吡咯的方法极为简便有效。温和的条件。Al(H 2 PO 4)3催化的芳香醛,芳香胺和β-酮酯的多组分反应在室温下,在乙醇中提供高官能度的哌啶,收率良好至极佳。这些功能化的哌啶的结构和相对立体化学通过单X射线晶体学分析证实。发现相同的催化剂可用于在环境温度下使用胺,乙炔二羧酸二烷基酯和甲醛在甲醇中的四组分反应来合成多官能化的二氢-2-氧基吡咯。发现该催化剂是可回收的,并且可以使用多达五次而不会显着降低其活性。
One-pot five-component synthesis of highly functionalized piperidines using oxalic acid dihydrate as a homogenous catalyst
作者:Seyed Sajad Sajadikhah、Malek Taher Maghsoodlou、Nourallah Hazeri、Sayyed Mostafa Habibi-Khorassani、Anthony C. Willis
DOI:10.1016/j.cclet.2012.03.008
日期:2012.5
An efficient green protocol is described for the preparation of highlyfunctionalizedpiperidines via a one-pot five-component reaction between aromatic aldehydes, anilines and β-ketoesters in the presence of oxalic acid dihydrate as catalyst in ethanol at ambient temperature. The structure as well as the relative stereochemistry of these compounds was confirmed by single X-ray crystallographic analysis
Alum as an efficient catalyst for the multicomponent synthesis of functionalized piperidines
作者:Ramneet Kaur、Annah Gupta、Kamal K. Kapoor
DOI:10.1007/s11164-017-2979-3
日期:2017.11
An effective approach to the synthesis of functionalized piperidines via a one-pot multicomponent reaction of aniline, β-ketoester and aldehyde in the presence of alum as an efficient catalyst has been reported. The present procedure offers advantages such as simple workup, short reaction time and offers rapid access to a variety of functionalized piperidines.
([TMBSED][OMs]2) was employed for the synthesis of piperidines and dihydropyrrol-2-ones via one-pot multi-component reactions in simple and green processes. This pseudo five-component reaction of aromatic aldehydes, anilines and alkyl acetoacetates was carried out under reflux conditions in ethanol to afford substituted piperidines. Also, dihydropyrrol-2-one derivatives were synthesized by means of four-component