Cathode Material Determines Product Selectivity for Electrochemical C−H Functionalization of Biaryl Ketoximes
作者:Huai‐Bo Zhao、Pin Xu、Jinshuai Song、Hai‐Chao Xu
DOI:10.1002/anie.201809679
日期:2018.11.12
N‐oxides has been developed through electrochemicalC−Hfunctionalization of biarylketoximes. The oxime substrates undergo dehydrogenative cyclization when a Pt cathode is used, resulting in unprecedented access to a wide range of N‐heteroaromatic N‐oxides. The products of the electrosynthesis are switched to the deoxygenated N‐heteroaromatics by employing a Pb cathode through sequential anode‐promoted
Shedding light on azides: [Ru(TPP)CO] (TPP=tetraphenyl porphyrin dianion), white light and O2 were found to be a suitable catalyst combination to perform the annulation of several biaryl azides (see scheme). The high chemoselectivity of the process allows the synthesis of phenanthridines and dihydrophenanthridines in good yield and purity.
Combination of PhI(OAc)<sub>2</sub> and 2-Nitropropane as the Source of Methyl Radical in Room-Temperature Metal-Free Oxidative Decarboxylation/Cyclization: Construction of 6-Methyl Phenanthridines and 1-Methyl Isoquinolines
A room-temperature metal-free method for generating highly unstable methyl radical was realized from the combination of PhI(OAc)2 and 2-nitropropane, which provides an efficient approach to methylated phenanthridines and isoquinolines. The strategy was also extended to the generation of other alkyl radicals and a concise synthesis of Roxadustat.
A binap-ligated copper dimer has been heterogenized on a pillar-layered MOF surface for the first time using a hydroxamic acid linker. This MOF-supported dimeric copper photocatalyst demonstrates much higher activity and recyclability than its homogeneous counterparts in intra- and intermolecular radicalreactions of N-acyloxy imidates and O-acyl oximes.