Efficient one-pot synthesis of functionalized piperidine scaffolds via ZrOCl2·8H2O catalyzed tandem reactions of aromatic aldehydes with amines and acetoacetic esters
作者:Sarita Mishra、Rina Ghosh
DOI:10.1016/j.tetlet.2011.03.116
日期:2011.6
A highly efficient diastereoselective one-potsynthesis of functionalized piperidines has been developed based on an aqua-compatible ZrOCl2·8H2O catalyst via tandem reactions of aromatic aldehydes, amines, and acetoacetic esters.
Abstract Silica gel has been found to be an efficient and reusable medium for the synthesis of diastereospecific functionalized piperidines in good to high yields by a one-pot three-component condensation of aldehyde, amine and β -ketoester under solvent-free conditions at room temperature. Using this environmentally benign, non-inflammable and non-toxic reaction medium, the non-chromatographic purification
Iodine catalyzed one-pot five-component reactions for direct synthesis of densely functionalized piperidines
作者:Abu T. Khan、Md. Musawwer Khan、Kranthi K.R. Bannuru
DOI:10.1016/j.tet.2010.07.075
日期:2010.9
convenient one-pot multicomponent reaction (MCR) has been developed for the synthesis of highlyfunctionalized piperidines catalyzed by molecular iodine. This strategy demonstrated five-componentreactions of 1,3-dicarbonyl compounds, amines and aromatic aldehydes in methanol using 10 mol % of iodine at room temperature. This methodology provides an alternative approach for easy access of highly and fully
One-pot Synthesis of Highly Functionalized Tetrahydropyridines: A Camphoresulfonic Acid Catalyzed Multicomponent Reaction
作者:Ruchi Bharti、Tasneem Parvin
DOI:10.1002/jhet.2268
日期:2015.11
method for the synthesis of a series of highlyfunctionalizedtetrahydropyridine derivatives has been achieved via multicomponentreaction of aromatic aldehydes, various amines, and β‐keto esters at room temperature using readily available (±)‐camphor‐10‐sulfonic acid as an organocatalyst. The current protocol offers an atom economic and environmentally benign method for the synthesis of the title compounds
Effects of Substituents in the β-Position of 1,3-Dicarbonyl Compounds in Bromodimethylsulfonium Bromide-Catalyzed Multicomponent Reactions: A Facile Access to Functionalized Piperidines
作者:Abu T. Khan、Tasneem Parvin、Lokman H. Choudhury
DOI:10.1021/jo8014962
日期:2008.11.7
w1,3-Dicarbonyl compounds can be converted to Mannich-type products A or highly functionalized piperidines B in the presence of a catalytic amount of bromodimethylsulfonium bromide (BDMS). The combination of aromatic aldehyde, amine, and 1,3-dicarbonyl compounds in the presence of a catalytic amount of BDMS leads to the formation of Mannich-type product A when R is a non-enolizable carbon or an alkoxy group, whereas in cases when R = CH3, the same combination yielded highly functionalized piperidines B. A synthetic study and mechanistic proposal are presented.