Selenium-Catalyzed Carbonylation of Nitroarenes to Symmetrical 1,3-Diarylureas under Atmospheric Pressure
作者:Xiaofang Wang、Shiwei Lu、Zhengkun Yu
DOI:10.1002/adsc.200303244
日期:2004.7
Selenium-catalyzedcarbonylation of nitrobenzene and substituted nitroarenes with CO underatmosphericpressure afforded symmetrical1,3-diarylureas in yields up to 94%. A mechanism has been proposed to demonstrate the formation of symmetrical ureas.
A ligand-free palladium-catalyzed aerobic oxidative carbonylation of amines for the synthesis of ureas, particular unsymmetrically N,N′-disubstituted ureas, which cannot be accessed by any other palladium-catalyzed oxidative carbonylation of amines to date, is presented. An array of symmetrical and unsymmetrical ureas were straightforwardly synthesized by using inexpensive, readily available, stable
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