i-PrI Acceleration of Negishi Cross-Coupling Reactions
摘要:
The Negishi cross-coupling of arylzinc reagents with various bromoanilines is accelerated by the presence of i-Prl (1 equiv) and furnished the expected biaryls within 5-12 min reaction time at 25 degrees C. Arylzinc reagents can also be cross-coupled under these conditions with a range of aryl bromides bearing an enolizable ester or acidic benzylic protons.
Aryl boronic acids can be trapped by an ammonium
hydroxide-form Dowex® Ion Exchangers resin
(D-OHâ) leading to polymer-ionically bound borates and
cyclized, when properly designed, into macroheterocycles under
SuzukiâMiyaura coupling conditions.
A Versatile Catalyst System for Suzuki−Miyaura Cross-Coupling Reactions of C(sp<sup>2</sup>)-Tosylates and Mesylates
作者:Brijesh Bhayana、Brett P. Fors、Stephen L. Buchwald
DOI:10.1021/ol9015892
日期:2009.9.3
A catalyst system for the Suzuki-Miyaura cross-coupling reactions of aryl and vinyl tosylates and mesylates has been developed. This catalyst displays excellent functional group tolerance and allows the coupling of heteroarylboronic acids with aryl tosylates and mesylates to be performed in high yields. Moreover, reactions employing alkylboronic acids, as well as heteroaryl, vinyl, and allylic pinacol boronate esters, were conducted with high efficiencies.
<i>i</i>-PrI Acceleration of Negishi Cross-Coupling Reactions
作者:Marcel Kienle、Paul Knochel
DOI:10.1021/ol1007026
日期:2010.6.18
The Negishi cross-coupling of arylzinc reagents with various bromoanilines is accelerated by the presence of i-Prl (1 equiv) and furnished the expected biaryls within 5-12 min reaction time at 25 degrees C. Arylzinc reagents can also be cross-coupled under these conditions with a range of aryl bromides bearing an enolizable ester or acidic benzylic protons.