Indium-mediated regioselective synthesis of ketones from arylstannanes under solvent-free ultrasound irradiation
作者:Marcos J. Lo Fiego、Mercedes A. Badajoz、Claudia Domini、Alicia B. Chopa、María T. Lockhart
DOI:10.1016/j.ultsonch.2012.10.018
日期:2013.5
drastically reduced (from 3-32h to 10-70min) under ultrasonic irradiation. Evidences for the involvement of a homolyticaromaticipso-substitution mechanism, in which indium metal acts as radical initiator, are presented. It is possible the transference of two aryl groups from tin, thus improving effective mass yield, working with diarylstannanes as starting substrates.
Palladium-catalyzed acylative cross-coupling of amides with diarylborinic acids and sodium tetraarylborates
作者:Xijing Li、Gang Zou
DOI:10.1016/j.jorganchem.2015.07.009
日期:2015.10
A general and efficient acylative Suzuki coupling of active amides with diarylborinic acids has been achieved by using 1 mol% Pd(PCy3)(2)Cl-2/0.6 mol% PCy3 as catalyst system taking advantage of modifiable reactivities of acyl-nitrogen bonds of amides. Both electronic and steric influences from either aryl or acyl counterparts on the coupling proved to be negligible or small. A variety of aryl ketones including sterically hindered ones could be synthesized by the coupling of diarylborinic acids in good to excellent yields. Sodium tetraarylborates could also be used as high atom-economy aryl source in the palladium-catalyzed cross-coupling with active amides. (C) 2015 Elsevier B.V. All rights reserved.
Catalyst-free alkanoylation of aromatic rings via arylstannanes. Scope and limitations
作者:Marcos J. Lo Fiego、María T. Lockhart、Alicia B. Chopa
DOI:10.1016/j.jorganchem.2009.07.019
日期:2009.10
The reaction of alkanoyl chlorides with arylstannanes in 1,2-dichlorobenzene (180 degrees C) is a simple and direct route for the catalyst-free and regioselective synthesis of tertiary alkyl aryl ketones in good to excellent isolated yields (55-77%). Nevertheless, under similar conditions, reactions carried out with alkanoyl chlorides bearing alpha-hydrogens render only the product of protodestannylation. (C) 2009 Elsevier B. V. All rights reserved.
Acylative Suzuki coupling of amides: acyl-nitrogen activation via synergy of independently modifiable activating groups
作者:Xijing Li、Gang Zou
DOI:10.1039/c5cc00430f
日期:——
Highly efficient Pd/PCy3-catalyzed acylative Suzuki coupling of carboxylic amides has been achieved to provide a variety of aryl ketones, including sterically hindered thus difficultly accessible ones.