Metal free chemoselective reduction of α-keto amides using TBAF as catalyst
作者:N. Chary Mamillapalli、Govindasamy Sekar
DOI:10.1039/c4ra13090a
日期:——
metal and ligand free chemoselective reduction of the keto group and complete reduction of the both keto and amide groups of α-keto amide with hydrosilanes using tetrabutylammoniumflouride (TBAF) as catalyst have been accomplished. This methodology affords an efficient and economic route for the synthesis of biologically important α-hydroxyamides and β-amino alcohols. The other important advantage of
[RuX(p-cymene)(bichep)]X, (X = I, Cl) and Ru(OAc)2(bichep) (bichep = 2,2′-bis(dicyclohexylphosphino)-6,6′-dimethyl-1,1′-biphenyl) proved to be highly efficient catalysts for asymmetric hydrogenation of carbonylcompounds bearing phenylglyoxyloyl group under mild conditions.
A simple and practical method for α-ketoamide synthesis via a decarboxylative strategy of isocyanates with α-oxocarboxylic acids is described. The reaction proceeds at room temperature under mild conditions without an oxidant or an additive, showing good substrate scope and functional compatibility. Moreover, the applicability of this method was further demonstrated by the synthesis of various bioactive
One pot synthesis of α-ketoamides from ethylarenes and amines: a metal free difunctionalization strategy
作者:Mani Ramanathan、Chun-Kai Kuo、Shiuh-Tzung Liu
DOI:10.1039/c6ob02361d
日期:——
One-pot and metalfreesynthesis of α-ketoamides has been described through in situ generation of aryl ketones from easily available ethylarenes followed by amidation with various amines. This multiple oxidation protocol involves catalytic I2–pyridine–TBHP (t-butyl hydroperoxide) mediated oxidative benzylic carbonylation and sequential NaI–TBHP mediated oxidative amidation without using any solvent
Copper-catalyzed oxidative cleavage of Passerini and Ugi adducts in basic medium yielding α-ketoamides
作者:Anirban Ghoshal、Mayur D. Ambule、Revoju Sravanthi、Mohit Taneja、Ajay Kumar Srivastava
DOI:10.1039/c9nj03533h
日期:——
oxidative cleavage of Passerini and Ugi adducts in the presence of base and copper(I) iodide is studied in detail. The oxidative cleavage yields α-ketoamides along with acids and amides from Passerini and Ugi adducts respectively. Mechanistic investigations revealed that the reaction proceeds via a radical pathway involving molecular oxygen. Control experiments with 18O-labeled Passerini adducts confirmed