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
Cerium Ammonium Nitrate-Catalyzed Multicomponent Reaction for Efficient Synthesis of Functionalized Tetrahydropyridines
作者:Hong-Juan Wang、Li-Ping Mo、Zhan-Hui Zhang
DOI:10.1021/co100055x
日期:2011.3.14
A highly atom-economic one-pot synthesis of functionalized tetrahydropyridines by a multicomponent condensation reaction of β-ketoester, two equivalents of aromatic aldehyde, and two equivalents of amine in the presence of a catalytic amount of cerium ammonium nitrate (CAN) is reported. In this way, a series of pharmacologically interesting substituted piperidine derivatives were obtained in moderate
<scp>l</scp>-Proline nitrate: a recyclable and green catalyst for the synthesis of highly functionalized piperidines
作者:Nikita R. Agrawal、Sandeep P. Bahekar、Prashant B. Sarode、Sanjio S. Zade、Hemant S. Chandak
DOI:10.1039/c5ra08022c
日期:——
Multi-component synthesis of highly functionalized piperidines has been demonstrated using ‘fully green’ l-proline nitrate as recyclable room temperature ionic liquid. Recycling of the catalyst was possible up to five runs without loss of catalyst activity.
1-Methyl-2-oxopyrrolidinium hydrogen sulfate ([Hpyro][HSO4]) is used as an ionic liquid catalyst for the one-potthree-componentsynthesis of highly substituted piperidines from aromatic aldehydes, anilines and β–ketoesters in refluxing ethanol. This homogeneous catalyst procedure has the advantages of easy work-up, no need for column chromatography, simple and readily available precursors, and good