direct C3 trifluoromethylation of 2-pyridones including unprotected derivatives by an electrochemical approach using the readily available Langlois reagent as the CF3 source in the absence of electrolytes. The trifluoromethylationunder transition metal- and oxidant-free conditions occurred site-selectively to give the desired products in moderate to good yields under ambient conditions. Interestingly
Herein, we report a novel regioselective [2 + 1] cyclization reaction of 2-pyridones with carbenes generated in situ via visible light irradiation, without the requirement for catalysts or additives. The diverse functional groups of 2-pyridones and diazo compounds exhibit good tolerance, enabling the rapidsynthesis of highly valuable cyclopropanated dihydro-2-pyridone scaffolds with exceptional regio-
C(sp<sup>2</sup>)–H Trifluoromethylation of enamides using TMSCF<sub>3</sub>: access to trifluoromethylated isoindolinones, isoquinolinones, 2-pyridinones and other heterocycles
作者:Vinayak Krishnamurti、Socrates B. Munoz、Xanath Ispizua-Rodriguez、Jeffrey Vickerman、Thomas Mathew、G. K. Surya Prakash
DOI:10.1039/c8cc04907f
日期:——
A method for the direct C(sp2)–H trifluoromethylation of enamides, including biologically relevant isoindolinones, isoquinolinones and 2-pyridinones using TMSCF3 under oxidative conditions is presented. The protocol is convenient, operationally simple and exhibits high tolerance across a multitude of relevant handles and functional groups.
pyridone derivatives has been developed using a stable electrophilic fluorinating reagent, N-fluorobenzenesulfonimide (NFSI). Interestingly, the fluorine atom is regioselectively introduced at the position opposite the carbonyl group in the pyridone substrate during the reaction. This method is applicable to a wide range of substrates and allows the regioselective late-stage monofluorination of pyridone