The manganese-catalyzed α-fluoroalkenylation of arenes via C–Hactivation and C–F cleavage has been described. This protocol provides a very useful method for the synthesis of monofluoroalkenes with predominant unconventional E-isomer selectivity which complements the existing strategies for the access to these molecular architectures. In addition, the selectivity of β-defluorination in the catalytic
Herein we present a novel strategy based on palladium-catalyzed allylic alkylation by taking advantage of the nucleophilic addition of external fluoride onto gem-difluoroalkenes as the initiation step. The merit of this protocol is highly appealing, as it enables a formal allylation of trifluoroethylarene derivatives through the in situ generation of β-trifluorocarbanions, which otherwise are deemed to
Radical Hydroboration and Hydrosilylation of <i>gem</i>-Difluoroalkenes: Synthesis of α-Difluorinated Alkylborons and Alkylsilanes
作者:Xiaozu Liu、E Emily Lin、Guojun Chen、Ji-Lin Li、Peijun Liu、Honggen Wang
DOI:10.1021/acs.orglett.9b03218
日期:2019.10.18
This protocol features good functional group tolerance, operational simplicity, high atom economy, and easy scale-up, enabling efficient assembly of a wide range of α-difluorinated alkylborons and alkylsilanes in moderate to excellent yields. The synthetic utility of these products is demonstrated by further transformation of the C–B bond and C–Si bond into valuable CF2-containing molecules.
A convenient photoredox‐catalyzed defluorinative trifluoromethylation of α‐trifluoromethyl alkenes and gem‐difluoroalkenes is developed. The reactions proceeded efficiently via trifluoromethyl radical addition followed by β‐fluorine elimination process, providing a new entry to multifluorinated alkenes in moderate to good yields with excellent stereoselectivity.
attracted much attention in the pharmaceutical and agrochemical industries. Many strategies have already been developed to achieve the synthesis of fluorinated heterocycles. Formidable challenges remain, however, in the synthesis of fluorinated isocoumarin derivatives that are among the most alluring structural motifs. Herein, the indium-catalyzed C−F bond transformation of 2-(2,2-difluorovinyl) benzoates