Ruthenium-Catalyzed Redox-Neutral C–H Activation via N–N Cleavage: Synthesis of N-Substituted Indoles
作者:Zhenxing Zhang、Hao Jiang、Yong Huang
DOI:10.1021/ol502998n
日期:2014.11.21
The first Ru-catalyzed redox-neutral C–H activation reaction via N–N bond cleavage is reported. Pyrazolidin-3-one is demonstrated as an internally oxidative directing group that enables C–H annulation reactions with a broad scope of alkynes, including previously incompetent terminal alkynes. Pharmacologically privileged 3-(1H-indol-1-yl)propanamides were synthesized in high yields.
A switchable synthesis of N-substituted indole derivatives from phenidones via rhodium-catalyzed redox-neutral C–H activation has been achieved. In this protocol, we firstly disclosed that the reactivity of Rh(III) catalysis could be enhanced through employing palladium acetate as an additive. Some representative features include external oxidant-free, applicable to terminal alkynes, short reaction