An efficient palladium-catalyzed alkoxycarbonylation of aryl halides with phenols has been developed. Various aryl benzoates have been isolated in good to excellent yields with formic acid as the CO source.
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