One-Pot, Solvent-Free Access to Unsymmetrical Ureas by Palladium-Catalysed Reductive Alkylation Using Molecular Hydrogen
作者:Tharwat Mohy El Dine、Simon Chapron、Marie-Christine Duclos、Nicolas Duguet、Florence Popowycz、Marc Lemaire
DOI:10.1002/ejoc.201300642
日期:2013.8
Palladium-catalysedreductivealkylation of monosubstituted ureas has been studied in the presence of aldehydes and usingmolecularhydrogen as a clean reductant. Unsymmetrical N,N′-disubstituted ureas were formed in good to excellent isolated yields (60–93 %) without the production of salt waste. This reaction was incorporated to a one-pot, solvent-free sequence involving the alkylation of monosubstituted