DIRECT CONVERSION OF PHENOLS INTO AMIDES AND ESTERS OF BENZOIC ACID
申请人:Alabugin Igor
公开号:US20110237798A1
公开(公告)日:2011-09-29
A method is provided for the preparation of an aromatic carboxylic acid aryl ester or an N-aryl aromatic carboxamide. The method comprises contacting an O,O-diaryl thiocarbonate or an O-aryl-N-aryl thiocarbamate with a reactant that regioselectively reacts with sulfur, which contact causes an O-neophyl rearrangement, thereby forming either the aromatic carboxylic acid aryl ester or the N-aryl aromatic carboxamide, respectively.
Radical O→C Transposition: A Metal-Free Process for Conversion of Phenols into Benzoates and Benzamides
作者:Abdulkader Baroudi、Jeremiah Alicea、Phillip Flack、Jason Kirincich、Igor V. Alabugin
DOI:10.1021/jo102467j
日期:2011.3.18
We report a metal-free procedure for transformation of phenols into esters and amides of benzoic acids via a new radical cascade. Diaryl thiocarbonates and thiocarbamates, available in a single high-yielding step from phenols, selectively add silyl radicals at the sulfur atom of the C═S moiety. This addition step, analogous to the first step of the Barton−McCombie reaction, produces a carbon radical
Metal‐Free Transformation of Phenols into Substituted Benzamides: A Highly Selective Radical 1,2‐O→C Transposition in<i>O</i>‐Aryl‐<i>N</i>‐phenylthiocarbamates
作者:Abdulkader Baroudi、Phillip Flack、Igor V. Alabugin
DOI:10.1002/chem.201002303
日期:2010.11.2
Radical merry‐go‐round: A highly efficient metal‐free transformation of phenols into benzamides is designed through one‐step conversion of phenols to aryl thiocarbamates and a subsequent radical addition/rearrangement/fragmentationcascade. Computational analysis fully rationalizes the experimentally observed selectivity. Despite the possible competition from NCfragmentation and N‐neophyl rearrangement