Transition-metal-free oxidative C5 C–H-halogenation of 8-aminoquinoline amides using sodium halides
作者:Ying Wang、Yang Wang、Kai Jiang、Qian Zhang、Dong Li
DOI:10.1039/c6ob02079h
日期:——
A simple and efficient transition-metal-free oxidative halogenation (Cl, Br) of the C5 C–H bond of 8-aminoquinoline amides has been developed. This method employed low-cost and innoxious sodium halides as halogenation reagents and oxone as an oxidant. The reactions demonstrated air and moisture tolerance, and good functional group compatibility, giving highly selective C5-halogenated products in good
The oxygenation of 8-aminoquinoline amides by benzoyl peroxide at the C5 position in water is developed in the absence of a transition metal catalyst, affording the desired products in moderate to good yields of up to 88%. Mechanism studies reveal that the reaction would involve a radical process.
Iron(III)-Catalyzed Highly Regioselective Halogenation of 8-Amidoquinolines in Water
作者:Yang Long、Lei Pan、Xiangge Zhou
DOI:10.3390/molecules24030535
日期:——
A simple protocol of iron(III)-catalyzedhalogenation of 8-amidoquinolines in water under mild conditions was developed, affording the 5-halogenlated products in good to excellent yields up to 98%. The reaction mechanism most likely involves a single-electron transfer (SET) process.
Site-selective C–H bond carbonylation with CO<sub>2</sub> and cobalt-catalysis
作者:Nagaraju Barsu、Deepti Kalsi、Basker Sundararaju
DOI:10.1039/c8cy02060d
日期:——
in situ-produced CO gas for C–Hbondcarbonylation using earth-abundant cobalt catalysts. The ease of handling CO2 gas at atmospheric pressure allows us to prepare 13C labelled compounds which are otherwise difficult to achieve. The procedure developed makes it possible to utilize CO2 as a CO source, which can be widely applied as a C1 synthon that can be incorporated between C–H and N–H bonds of aromatic
A simple and efficient copper-catalyzed monofluoromethylation of 8-aminoquinolines with 2-bromo-2-fluoroacetate has been described with HPO(OMe)2 (dimethyl phosphonate) as reductant. The reaction tolerates a variety of quinoline amides and monofluoroalkyl bromides. Significant advantages of this protocol include synthetic convenience and high reaction efficiency.