Transesterification of (hetero)aryl esters with phenols by an Earth-abundant metal catalyst
作者:Jianxia Chen、E. Namila、Chaolumen Bai、Menghe Baiyin、Bao Agula、Yong-Sheng Bao
DOI:10.1039/c8ra04984j
日期:——
for the transesterification of aryl or heteroaryl esters with phenols which is a challenging and underdeveloped transformation. The simple conditions and the use of heterogeneous alkali metal catalyst make this protocol very environmentally friendly and practical. This reaction fills in the missing part in transesterification reaction of phenols and provides an efficient approach to aryl esters, which
Highly chemoselective deoxygenation of N-heterocyclic <i>N</i>-oxides under transition metal-free conditions
作者:Se Hyun Kim、Ju Hyeon An、Jun Hee Lee
DOI:10.1039/d1ob00260k
日期:——
the most useful tools for synthesizing various N-heterocyclic compounds, the highly chemoselective deoxygenation of densely functionalized N-heterocyclic N-oxides has received much attention from the synthetic chemistry community. Here, we provide a protocol for the highly chemoselective deoxygenation of various functionalized N-oxides under visible light-mediated photoredox conditions with Na2-eosin
Total reactivity of pyridine and quinoline via the reactions of arylbenzoates with hydroxide ion. Apparent substituent constants for some N-heteroaromatic groups
A new set of apparent σ values was evaluated for the aza substitution of all positions in pyridyl and quinolyl groups on the basis of the alkaline hydrolysis of aryl benzoates. The enhanced reactivities of 4-pyridyloxy- and 4-quinolyloxy- groups were first estimated quantitatively.
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