Cu-mediated or metal-free alkylation of gem-dibromoalkenes with tertiary, secondary and primary alkyl Grignard reagents
作者:Yupian Deng、Xuxue Zhang、Chuan Liu、Song Cao
DOI:10.1016/j.tet.2020.131804
日期:2021.2
A novel copper-mediated or transition-metal-free alkylation of gem-dibromoalkenes with tertiary, secondary and primary alkylGrignardreagents was described. The outcomes of these reactions were found to be highly dependent on the reaction conditions and the type of Grignardreagents used. Specifically, the tertiary alkylation of gem-dibromoalkenes proceeded efficiently in the presence of 50 mol% CuCN
Metal-Free Oxidative Decarbonylative Hydroalkylation of Alkynes with Secondary and Tertiary Alkyl Aldehydes
作者:Xuan-Hui Ouyang、Ren-Jie Song、Bang Liu、Jin-Heng Li
DOI:10.1002/adsc.201501113
日期:2016.6.16
A new, metal‐free, radical‐mediated oxidative decarbonylative hydroalkylation of various alkynes with secondary and tertiary alkyl aldehydes using di‐tert‐butyl peroxide (DTBP) as oxidant is presented. This method enables the simultaneous formation of a CC bond and a CH bond through a sequence of decarbonylation, radical addition and protonation, and provides a straightforward route for transforming
Copper- and Nickel-Catalyzed Cross-Coupling Reaction of Monofluoroalkenes with Tertiary, Secondary, and Primary Alkyl and Aryl Grignard Reagents
作者:Hongyan Shi、Wenpeng Dai、Biyun Wang、Song Cao
DOI:10.1021/acs.organomet.7b00859
日期:2018.2.12
with tertiary, secondary, and primary alkyl and aryl Grignardreagents in the presence of a catalytic amount of copper or nickel catalyst, respectively, has been developed. The reactions proceeded smoothly at room temperature, providing (E)-alkene isomers in moderate to high yields. Plausible mechanisms of the Ni-catalyzed coupling reaction of monofluoroalkene with Grignardreagents are suggested.
作者:Hayden A. Sharma、Katrina M. Mennie、Eugene E. Kwan、Eric N. Jacobsen
DOI:10.1021/jacs.0c08150
日期:2020.9.16
these rearrangement reactions, with the pathway depending on the identity of the migrating group. In reactions involving alkyl-group migration, intermolecular fluo-ride attack is product- and enantio-determining. In contrast, reactions in which aryl rearrangement occurs proceed through an enantiodetermining intramolecular1,2-migration prior to fluorination. The fact that both pathways are promoted by