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.