Copper-Catalyzed, N-Directed Csp<sup>3</sup>–H Trifluoromethylthiolation (−SCF<sub>3</sub>) and Trifluoromethylselenation (−SeCF<sub>3</sub>)
作者:Atanu Modak、Emily N. Pinter、Silas P. Cook
DOI:10.1021/jacs.9b10316
日期:2019.11.20
A direct and versatile copper-catalyzed trifluoromethylthiolation and trifluoromethylselenation of primary, secondary, and tertiary aliphatic C-H bonds was developed. The reaction provides direct access to molecules containing these emerging moieties in the presence of a wide range of common functional groups and in complex molecular environments.
Photoredox-Mediated Mono- and Difluorination of Remote Unactivated Methylene C(sp<sup>3</sup>)–H Bonds of <i>N</i>-Alkyl Sulfonamides
作者:Zhiqiang Deng、Zhenxiang Zhao、Gang He、Gong Chen
DOI:10.1021/acs.orglett.1c01020
日期:2021.5.7
A photoredox-mediated δ-C(sp3)–H fluorination of sulfonyl-protected primary alkylamines with Selectfluor is developed. The reaction can proceed in excellent monofluorination selectivity for amine substrates without α substituent. For α-substituted substrates, a slightly modified reaction conditions with two rounds of operation gives the δ,δ-difluorination products in good yield. Mechanistic studies