A dehydrogenative [3 + 2] annulation reaction of aniline derivatives and alkenes has been developed via the ruthenium-electron catalytic systems for the synthesis of versatile indolines. Electricity is used as a sustainable oxidant to regenerate the active Ru(II) catalyst and promote H2 evolution. This protocol is ecofriendly and easy to handle as it uses a simple undivided cell in mild conditions without the employment of metal oxidants.
Multiple Roles of the Pyrimidyl Group in the Rhodium‐Catalyzed Regioselective Synthesis and Functionalization of Indole‐3‐carboxylic Acid Esters
作者:Hui Jiang、Shang Gao、Jinyi Xu、Xiaoming Wu、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.201500769
日期:2016.1.21
A regioselective synthesis of indole‐3‐carboxylic acid esters from anilines and diazo compounds has been realized by making use of the pyrimidyl group‐assisted rhodium‐catalyzed CH activation and CNbond formation. The reaction proceeds under mild conditions, exhibits good functional group tolerance and scalability. Reutilization of the pyrimidyl directing group in the resulting products provided
catalyst-controlled chemodivergent approach to access C2-substituted indoles and diverse aniline derivatives with good chemo- and stereoselectivity by employing vinylcyclopropanes (VCPs) as coupling partners via a tandem C–H/C–C activation/annulation strategy. The key feature of this work is the divergent reactivity profile showcased by VCPs, going beyond allylation under a high-valent Rh-/MPAA catalyst system