Direct borylation of benzylic alcohols has been achieved via an iodine-catalyzed process. This transition-metal-free borylation transformation is compatible with various functional groups and provides a practical and convenient method to access important and useful benzylic boronate esters from widely available benzylic alcohols. Preliminary mechanistic investigations indicated that benzylic iodide
Pd-Catalyzed Organometallic-Free Homologation of Arylboronic Acids Enabled by Chemoselective Transmetalation
作者:Kane A. C. Bastick、Allan J. B. Watson
DOI:10.1021/acscatal.3c00921
日期:2023.5.19
A Pd-catalyzed homologation of arylboronicacids is reported. Halomethylboronic acid pinacol esters (Bpin) undergo a remarkably facile, yet rare, oxidative addition enabled by an α-boryl effect. Simultaneous chemoselective transmetalation allows use of these metalloid reagents for formal C1 insertion to deliver benzyl Bpin products without the requirement for stoichiometric organometallic reagents