Moreover, some of themhavebeenfoundtobeusefulasinhibitorsofaminopeptidaseandalpha-glucosidase. Numerous recent methods reported for the synthesis of highly substituted piperidines use various catalytic systems such as bismuth nitrate, molecular iodine, bromodimethyl-sulfonium bromide (BDMS), tetra(n-butyl)ammonium tribromide (TBATB), InCl3, 21 CAN, ZrOCl2.8H2O, 23 picric acid, ionicliquids, ZrCl4, 26
Multicomponent preparation of highly functionalized piperidines using magnesium hydrogen sulfate as an efficient catalyst
作者:Mohammad Reza Mohammad Shafiee、Batool Hojati Najafabadi、Majid Ghashang
DOI:10.1007/s11164-012-0878-1
日期:2013.10
Abstract A simple, highly versatile, and efficientsynthesis of functionalized piperidines is achieved by four-component cyclo-condensation of aldehydes, aromatic amines, and acetoacetic esters using magnesium hydrogensulfate [Mg(HSO4)2] as a catalyst in acetonitrile as the solvent at roomtemperature. The key advantages of this procedure are high yields, easy work-up, and purification of products
([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
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.
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