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.
Trityl chloride as an efficient organic catalyst for one-pot, five-component and diastereoselective synthesis of highly substituted piperidines
作者:Seyed Sajad Sajadikhah、Nourallah Hazeri、Malek Taher Maghsoodlou、Sayyed Mostafa Habibi-Khorassani、Anthony C. Willis
DOI:10.1007/s11164-012-0997-8
日期:2014.2
chloride is used as an efficient organic catalyst for the one-pot, five-component and diastereoselective synthesis of highly substituted piperidines by means of reaction between aromatic aldehydes, amines and β -ketoesters in methanol at 50 °C. The structure as well as relative stereochemistry of products was confirmed by single X-ray crystallographic analysis. This homogeneous catalyst procedure includes
Synthesis of highly functionalized piperidines by one-pot multicomponent reaction using tetrabutylammonium tribromide (TBATB)
作者:Abu T. Khan、Mohan Lal、Md. Musawwer Khan
DOI:10.1016/j.tetlet.2010.06.069
日期:2010.8
Tetrabutylammonium tribromide (TBATB) has been found to be an efficient catalyst for the one-potsynthesis of highly substituted piperidines through a combination of 1,3-dicarbonyl compounds, aromatic aldehydes, and various amines in ethanol at room temperature. Atom economy, good yields, environmentally benign, and mild reaction conditions are some of the important features of this protocol.
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
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.