Homobenzylic Oxygenation Enabled by Dual Organic Photoredox and Cobalt Catalysis
作者:Joshua B. McManus、Jeremy D. Griffin、Alexander R. White、David A. Nicewicz
DOI:10.1021/jacs.0c04422
日期:2020.6.10
Activation of aliphatic C(sp3)-H bonds in the presence of more activatedbenzylicC(sp3)-H bonds is often a nontrivial, if not impossible task. Herein we show that leveraging the reactivity of benzylicC(sp3)-H bonds to achieve reactivity at the homobenzylic position can be accomplished using dual organic photoredox/cobalt catalysis. Through a two-part catalytic system, alkyl arenes undergo dehydrogenation
Diacyl Disulfide: A Reagent for Chemoselective Acylation of Phenols Enabled by 4-(<i>N</i>,<i>N</i>-Dimethylamino)pyridine Catalysis
作者:Hong-Xin Liu、Ya-Qian Dang、Yun-Fei Yuan、Zhi-Fang Xu、Sheng-Xiang Qiu、Hai-Bo Tan
DOI:10.1021/acs.orglett.6b02818
日期:2016.11.4
A general and excellent acylation reagent, diacyl disulfide, was uncovered for efficient ester formation enabled by DMAP (4-(N,N-dimethylamino)pyridine) catalysis. This protocol offered a promising synthetic platform on site-selective acylation of phenolic and primary aliphatic hydroxyl groups, which greatly expanded the realm of protecting group chemistry. The importance of the reagent was also reflected