Ortho- and para-selective ruthenium-catalyzed C(sp2)-H oxygenations of phenol derivatives

Org Lett. 2013 Jul 5;15(13):3484-6. doi: 10.1021/ol401535k. Epub 2013 Jun 25.

Abstract

Versatile ruthenium catalysts allowed for efficient direct oxygenations of aryl carbamates under remarkably mild reaction conditions. In addition to chelation-assisted C-H activation, the optimized ruthenium catalyst proved amenable to para-selective hydroxylations of anisoles without Lewis basic directing groups.