A facile regio- and stereoselective synthesis of trans-ethyl 5-aroyl-4-aryl-2-[(arylsulfonyl)methyl]-4,5-dihydrofuran-3-carboxylates
作者:Palani Sokkan Harikrishnan、Stephen Michael Rajesh、Abdulrahman I. Almansour、Subbu Perumal
DOI:10.3998/ark.5550190.p007.921
日期:——
A library of novel trans -ethyl 5-aroyl-4-aryl-2-((arylsulfonyl)methyl)-4,5-dihydrofuran-3- carboxylates were synthesized regio- and stereoselectively in good yields by a three-component domino reaction of ethyl-3-oxo-4-(arylsulfonyl)butanoates, aromatic aldehydes and N- phenacylpyridinium bromide in presence of triethylamine in acetonitrile under heating. This transformation generates C-O, C-C and
A microwave-mediated catalyst- and solvent-free regioselective Biginelli reaction in the synthesis of highly functionalized novel tetrahydropyrimidines
作者:Palani Sokkan Harikrishnan、Stephen Michael Rajesh、Subbu Perumal、Abdulrahman I. Almansour
DOI:10.1016/j.tetlet.2012.12.034
日期:2013.2
novel ethyl 2-oxo/thio-4-aryl-6-(arylsulfonylmethyl)-1,2,3,4-tetrahydropyrimidine-5-carboxylates has been synthesized regioselectively by the Biginelli reaction of ethyl 3-oxo-4-(arylsulfonyl)butanoate, aromatic aldehyde and urea/thiourea under microwave irradiation and solvent- and catalyst-free conditions.
Facile domino reactions in the statistically controlled product- and stereoselective synthesis of densely functionalized cis-1,4-cyclohexa-1,4-dienes and trans,trans-trisubstituted-1,2,5,6-tetrahydropyridines
作者:Palani Sokkan Harikrishnan、Stephen Michael Rajesh、Subbu Perumal
DOI:10.1016/j.tetlet.2012.05.071
日期:2012.7
The domino reactions of ethyl 3-oxo-4-(arylsulfonyl)butanoates with aromatic aldehydes in a 2:1 molar ratio in the presence of a catalytic amount of ammonium acetate furnished densely functionalized cyclohexa-1,4-dienes stereoselectively, while the domino reactions of ethyl 3-oxo-4-(arylsulfonyl)butanoates, aromatic aldehydes, and ammonium acetate in a 1:2:2 molar ratio afforded highly functionalized 1,2,5,6-tetrahydropyridines stereoselectively. (C) 2012 Elsevier Ltd. All rights reserved.
Ru-Catalyzed Asymmetric Hydrogenation of γ-Heteroatom Substituted β-Keto Esters
A series of enantiomerically pure γ-heteroatom substituted β-hydroxy esters were synthesized with high enantioselectivities (up to 99.1% ee) by hydrogenation of γ-heteroatom substituted β-ketoesters in the presence of Ru-(S)-SunPhos catalyst. These asymmetrichydrogenations provide key building blocks for a variety of naturally occurring and biologically active compounds.