Palladium-Catalyzed Regioselective C-H Acetoxylation of 2-Aryloxypyridines with 2-Pyridyloxy as a Removable Directing Group
作者:Liang Wang、Liang Pan、Yibo Huang、Qun Chen、Mingyang He
DOI:10.1002/ejoc.201600508
日期:2016.6
A simple and regioselectivepalladium-catalyzed ortho-C(sp2)–H acetoxylation of 2-aryloxypyridines with PhI(OAc)2 as both the oxidant and acetate source has been developed. The mono- and di-acetoxylated products can be achieved by tuning the equivalents of PhI(OAc)2 and the reaction temperature. A wide range of 2-aryloxypyridines is tolerated. Moreover, 2-pyridyloxyl and acetyl groups can be easily
Cobalt-Catalyzed C–H Acetoxylation of Phenols with Removable Monodentate Directing Groups: Access to Pyrocatechol Derivatives
作者:Quan Gou、Xiaoping Tan、Mingzhong Zhang、Man Ran、Tengrui Yuan、Shuhua He、Linzong Zhou、Tuanwu Cao、Feihua Luo
DOI:10.1021/acs.orglett.0c00312
日期:2020.3.6
An efficient cobalt-catalyzed C-Hacetoxylation of phenols has been developed by using PIDA (phenyliodine diacetate) as a sole acetoxy source to synthesize pyrocatechol derivatives for the first time. The key feature of this method is the use of earth-abundant metal cobalt as the green and inexpensive catalyst for the acetoxylation of C(sp2)-H bonds under neutral reaction conditions. Furthermore, the