Ortho- and Para-Selective Ruthenium-Catalyzed C(sp2)–H Oxygenations of Phenol Derivatives
摘要:
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.
A phosgene‐ and metal‐free synthesis of O‐aryl carbamates is realized through a three‐component coupling of carbondioxide, amines and diaryliodoniumsalts. The reaction only requires a base as the promoter, providing access to a diverse array of O‐aryl carbamates in moderate to high yields with excellent chemoselectivity.
<i>Ortho</i>- and <i>Para</i>-Selective Ruthenium-Catalyzed C(sp<sup>2</sup>)–H Oxygenations of Phenol Derivatives
作者:Weiping Liu、Lutz Ackermann
DOI:10.1021/ol401535k
日期:2013.7.5
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.