A silver‐mediated oxidative difluoromethylation of styrenes and vinyl trifluoroborates with TMSCF2H is reported for the first time. This method enables direct and facile access to CF2H‐alkenes from abundant alkenes with excellent functional‐group compatibility. Moreover, this Ag/TMSCF2H protocol could further enable a series of radical difluoromethylation reactions of a wide array of substrates, offering
A straightforward palladium-catalyzed oxidative C-3 arylation of quinoxalin-2(1H)-ones with arylboronicacids is reported. This protocol is compatible with a wide range of functional groups and allows construction of various biologically important quinoxalin-2(1H)-one backbones.
Direct C3−H amination of quinoxalin‐2(1H)‐ones with azoles has been achieved in a very fast manner. This protocol features broad substrate scope, good yields, and mild reaction conditions.
Rationalization of Benzazole-2-carboxylate versus Benzazine-3-one/Benzazine-2,3-dione Selectivity Switch during Cyclocondensation of 2-Aminothiophenols/Phenols/Anilines with 1,2-Biselectrophiles in Aqueous Medium
作者:Tejas M. Dhameliya、Sumit S. Chourasiya、Eshan Mishra、Pradeep S. Jadhavar、Prasad V. Bharatam、Asit K. Chakraborti
DOI:10.1021/acs.joc.7b01548
日期:2017.10.6
insights of these cyclocondensation reactions using the hard–soft acid–base principle, quantum chemical calculations (density functional theory), and orbital interaction studies rationalize the selectivityswitch of benzothiazole-2-carboxylates versus benzazine-3-ones/benzazine-2,3-diones. The presence of water facilitates these cyclocondensation reactions by lowering of the energy barrier.