Synthesis of Biaryls and Aryl Ketones<i>via</i>Microwave-Assisted Decarboxylative Cross-Couplings
作者:Lukas J. Gooßen、Bettina Zimmermann、Christophe Linder、Nuria Rodríguez、Paul P. Lange、Jens Hartung
DOI:10.1002/adsc.200900337
日期:2009.11
A protocol for the microwave-assisted decarboxylative cross-couplings of carboxylic acid salts with aryl halides has been developed that allows the synthesis of various biaryls and aryl ketones in high yields. After careful adaptation of the bimetallic catalyst system and reaction conditions, these mechanistically complex transformations can now be performed within only five minutes in concentrated
The copper‐catalyzed decarboxylation of carboxylic aromaticacids has been advantageously achieved by using aliphatic amines like tetramethylethylenediamine (TMEDA) or hexamethylenetetraamine (HMTA) as ligands instead of the aromatic heterocyclic amines (quinoline, phenanthroline) used until now. The improvement is significant since the reaction can be performed at a lower temperature (ca. 50 °C less)
Potassium salts (22) of various carboxylic acids readily react with 2, 2'-oxalyldi(2, 3-dihydro-3-oxobenzisosulfonazole) (17) to form the corresponding 2-acyl-2, 3-dihydro-3-oxobenzisosulfonazoles (24) as intermediates, which undergo aminolysis, alcoholysis, and thioalcoholysis to afforded amides (5), esters (6), and thioesters (7), respectively. These findings show that 17 can be conveniently used as a condensing agent for the synthesis of carboxylic acid derivatives (5, 6 or 7).
One-step process for preparing anhydrous, organic acid alkali or alkaline earth metal salts by contacting and reacting an organic or polymeric acid fluoride, anhydride or ester and an organic alkali or alkaline earth metal silanolate.
GREEN, COPPER-CATALYZED DISPROPORTIONATION OF AROMATIC AND HETEROAROMATIC CARBOXYLATES TO DICARBOXYLATES
申请人:Iowa State University Research Foundation, Inc.
公开号:US20200157071A1
公开(公告)日:2020-05-21
The present application relates to a process for preparation of a compound of Formula (I) and Formula (IV):
wherein
is as described herein; and
wherein
and R are as described herein.