Nickel-Catalyzed Allylic Defluorinative Cross-Electrophile Coupling with Cycloalkyl Silyl Peroxides as the Alkyl Source
作者:Haiyan Dong、Zhiyang Lin、Chuan Wang
DOI:10.1021/acs.joc.1c02674
日期:2022.1.7
silyl peroxides (CSP) as an electrophilic coupling partner in the cross-electrophile coupling reaction. Diverse CSP are efficiently cross-coupled with an array of α-trifluoromethyl alkenes under the catalysis of nickel with the assistance of zinc as the reducing agent. This method allows the use of unstrained CSP as the carbonyl-containing alkyl source in the allylic defluorinative reaction, to access
Visible-Light-Mediated C–I Difluoroallylation with an α-Aminoalkyl Radical as a Mediator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c02905
日期:2021.9.17
for direct visible-light-mediated C–I difluoroallylation reactions of α-trifluoromethyl arylalkenes with alkyliodides at room temperature with an α-aminoalkyl radical as a mediator. The protocol permits efficient functionalization of various α-trifluoromethyl arylalkenes with cyclic and acyclic primary, secondary, and tertiary alkyliodides and is scalable to the gram level. This mild protocol uses
Synthesis of <i>gem</i>-Difluoroalkenes via Nickel-Catalyzed Allylic Defluorinative Reductive Cross-Coupling
作者:Yun Lan、Feiyan Yang、Chuan Wang
DOI:10.1021/acscatal.8b02784
日期:2018.10.5
ted alkenes was achieved with easily accessible primary, secondary and tertiary alkyl halides as the coupling partners and Zn-powder as reducing agent. This process provides an efficient and convenient entry to gem-difluoroalkenes bearing various sensitive functional groups under mild reaction conditions. Moreover, this method proves to be suitable for late-stage functionalization of multifunctional
Titanocene-Catalyzed Reductive Domino Epoxide Ring Opening/Defluorinative Cross-Coupling Reaction
作者:Zhiyang Lin、Yun Lan、Chuan Wang
DOI:10.1021/acs.orglett.0c00960
日期:2020.5.1
method for efficient synthesis of gem-difluorobishomoallylic alcohols starting from trifluoromethyl-substituted alkenes and epoxides via a titanocene-catalyzed reductive domino reaction, which consists of a Ti(III)-mediated radical-type ring opening and the following allylic defluorinative cross-coupling reaction via sequential radical addition and β-F elimination. Notably, complete regioselectivity and
Glycosyl-Radical-Based Synthesis of <i>C</i>-Alkyl Glycosides via Photomediated Defluorinative <i>gem</i>-Difluoroallylation
作者:Cai-Yi Li、Yue Ma、Zhi-Wei Lei、Xiang-Guo Hu
DOI:10.1021/acs.orglett.1c03390
日期:2021.11.19
We have developed a stereoselective, glycosyl radical-based method for the synthesis of C-alkyl glycosides via a photomediated defluorinative gem-difluoroallylation reaction. We demonstrate for the first time that glycosyl radicals, generated from glycosylbromides, can readily participate in a photomediated radical polar crossover process, affording a diverse array of gem-difluoroalkene containing