Palladium-catalyzed Suzuki–Miyaura reaction of fluorinated vinyl chloride: a new approach for synthesis α and α,β-trifluoromethylstyrenes
作者:Yang Li、Bo Zhao、Kun Dai、Dong-Huai Tu、Bo Wang、Yao-Yu Wang、Zhao-Tie Liu、Zhong-Wen Liu、Jian Lu
DOI:10.1016/j.tet.2016.07.085
日期:2016.9
A mild and efficient palladium-catalyzed cross-coupling between fluorinated vinyl chloride and arylboronic acids is described. The use of ligand B successfully overcomes the strong electronic withdrawing of trifluoromethylated substrates and allows the efficient synthesis of a wide range of α and α,β-trifluoromethyl containing olefins. By using this method, the keyintermediate for synthesis of Efavirenz
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
2-trifluoromethyl-1-alkenes and alkynes with the aid of Et3SiH provides 1,1-difluoro-1,4-dienes under mild reaction conditions. This reaction involves selective allylic C(sp3)–F bond activation via β-fluorine elimination from nickelacyclopentenes.
aldehydes and α-trifluoromethyl alkenes, which provides novel and efficientaccess to diverse gem-difluorohomoallylic alcohols. Remarkably, the high chemoselectivity of this reaction enables the conversion of the formyl moiety in the presence of various easily reducible functionalities including ketone, organohalides, aziridine, sulfone, alkyne, and unactivated alkene. The utility of this method is demonstrated
Photocatalytic, Phosphoranyl Radical-Mediated N–O Cleavage of Strained Cycloketone Oximes
作者:Peng-Ju Xia、Zhi-Peng Ye、Yuan-Zhuo Hu、Dan Song、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.orglett.9b00651
日期:2019.4.19
A photoinduced, phosphoranyl radical-mediated protocol for the direct N–O cleavage of strained cycloketone oximes via a polar/SET crossover process was developed for the first time. This visible-light-driven direct N–O activation mode for oxime offers beneficial features such as streamlined synthetic process and versatile photochemical reactivities. Consequently, the alkenes and α-trifluoromethyl alkenes