Pd-Catalyzed Direct and Selective CH Functionalization: C3-Acetoxylation of Indoles
作者:Qiang Liu、Gang Li、Hong Yi、Pan Wu、Jie Liu、Aiwen Lei
DOI:10.1002/chem.201002547
日期:2011.2.18
one! A novel Pd‐catalyzed direct and selectiveC3‐acetoxylation of indole derivatives has been accomplished (see scheme). This selective CH activation reaction was implemented without the assistance of directing groups and took place undermildconditions. The kinetic study revealed that the reaction was zero‐order with respect to the oxidant and first‐order with respect to the indole derivatives.
A novel gold-catalyzed ethynylation of aromatic rings with electron-deficient alkynes via gold catalyzed C-H activation of both C(sp)-H and C(sp(2))-H bonds has been developed. This transformation provides aromatic propiolates difficult to prepare by other methods, highlighting the synthetic potential of gold chemistry.
作者:Qiang Liu、Qing Yong Zhao、Jie Liu、Pan Wu、Hong Yi、Aiwen Lei
DOI:10.1039/c2cc17815j
日期:——
A trans diacyloxylation of indoles is accomplished by employing PhI(OAc)2 as the oxidant. A broad range of functional groups are well tolerated. Both the electronic properties of the N-protecting groups of indoles and the acidity of the reaction media play important roles in the selectivity of indole acyloxylation reactions.
Palladium-Catalyzed Direct and Regioselective C−H Bond Functionalization/Oxidative Acetoxylation of Indoles
作者:Pui Ying Choy、Chak Po Lau、Fuk Yee Kwong
DOI:10.1021/jo101584k
日期:2011.1.7
The first general examples of palladium-catalyzeddirect and selective oxidative C3-acetoxylation of indoles are presented. The mild reaction conditions (70 °C and with weak base, KOAc) in this indole C−H-acetoxylation are notable.
A novel Cu(OAc)2-catalysed direct C–H bond oxidative acetoxylation and iodination of indoles using PhI(OAc)2 as a terminal oxidant is reported. Adopting this method, a series of 3-iodoindoles and indol-3-ylacetates were obtained in nearly 1:1 ratio yield.