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。
Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O as Efficient Catalyst for One-pot Synthesis of Highly Functionalized Piperidines
Fe(NO3)3·9H2O is used as an efficient and effective catalyst for the one‐pot three‐component synthesis of highlyfunctionalizedpiperidines from aromatic aldehydes, anilines and b–ketoesters in ethanol at ambient temperature. This procedure includes some important aspects like the easy work‐up, no need to column chromatography, simple and readily available precursors, and good to high yields.
The three-component one-potsynthesis of highlyfunctionalizedpiperidine derivatives was carried out by condensing 1,3-dicarbonyl compounds with aromatic aldehydes and aniline using a catalytic amount (10 mol%) of LaCl3·7H2O in methanol at room temperature. The main features of current protocol include easy work up, mild reaction conditions, good yields and high atom economy.Graphical Abstract
Green and facile synthesis of dihydropyrrol-2-ones and highly substituted piperidines using ethylenediammonium diformate (EDDF) as a reusable catalyst
作者:Mahboobeh Zarei、Seyed Sajad Sajadikhah
DOI:10.1007/s11164-016-2512-0
日期:2016.9
Abstract Extremely facile and efficient procedures have been developed for the synthesis of dihydropyrrol-2-ones and highly substituted piperidines. One-pot four-component reaction of amines, dialkyl acetylenedicarboxylates, and formaldehyde in the presence of ethylenediammonium diformate in ethanol under reflux conditions provides N-aryl-3-amino dihydropyrrol-2-one-4-carboxylates in good to high yields
efficient, one-pot synthesis of functionalized tetrahydropyridines by multicomponent condensation of ethyl acetoacetate, two equivalents of aromaticaldehyde, and aromatic amine in the presence of a catalytic amount of NO2-Fe(III)PcCl@C is reported. In this way, a series of pharmacologically interesting substitutedpyridine derivatives were obtained in moderate to good yields.