One-Pot Synthesis of Symmetrical 1,3-Diarylureas or Substituted Benzamides Directly from Benzylic Primary Alcohols and Effective Oxidation of Secondary Alcohols to Ketones Using Phenyliodine Diacetate in Combination with Sodium Azide
primary alcohols can be directly converted into symmetrical 1,3-diarylureas or substituted benzamides via an one-pot oxidative reaction using the combined reagent of phenyliodine diacetate and sodium azide. This new reaction constitutes a step-economical way to prepare symmetric 1,3-diarylureas or substituted benzamides depending upon the substituents on the phenyl rings of starting alcohols. The sodium
Cobalt/Rhodium Heterobimetallic Nanoparticle-Catalyzed Oxidative Carbonylation of Amines in the Presence of Carbon Monoxide and Molecular Oxygen to Ureas
作者:Ji Hoon Park、Jae Chun Yoon、Young Keun Chung
DOI:10.1002/adsc.200900106
日期:2009.6
Abstractmagnified imageAn environmentally friendly oxidative carbonylation of aliphatic and aromatic primary amines to ureas has been successfully achieved in the presence of a catalytic amount of cobalt/rhodium heterobimetallic nanoparticles without any promoters. The catalyst system could be reused with only a slight loss of catalytic activity.
Imidazole-Promoted Synthesis of <i>N</i>-Substituted Phthalimide from <i>N</i>,<i>N</i>′-Disubstituted Ureas in Solventless Conditions
作者:Ricardo A. W. Neves Filho、Mieder A. T. Palm-Forster、Ronaldo N. de Oliveira
DOI:10.1080/00397911.2011.651677
日期:2013.6.3
A series of N-substituted phthalimides was synthesized by a thermal reaction between N,N-disubstituted ureas and phthalic acid catalyzed by imidazole in solventless conditions. The products have been obtained in moderate to good yields (53-92%). Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) to view the free supplemental file.
Pushing Back the Limits of Hydrosilylation: Unprecedented Catalytic Reduction of Organic Ureas to Formamidines
作者:Jacky Pouessel、Olivier Jacquet、Thibault Cantat
DOI:10.1002/cctc.201300653
日期:2013.12
Pushing back the limits: A novel catalytic transformation has been designed to prepare formamidine derivatives by reduction of substituted ureas with hydrosilanes. Simple iron catalysts based on commercially available iron salts and phosphine ligands prove to be highly active in promoting this new hydrosilylation reaction.