Photoredox-Catalyzed Intramolecular Aminodifluoromethylation of Unactivated Alkenes
作者:Zuxiao Zhang、Xiaojun Tang、Charles S. Thomoson、William R. Dolbier
DOI:10.1021/acs.orglett.5b01616
日期:2015.7.17
A photoredox catalyzed aminodifluoromethylation of unactivated alkenes has been developed in which HCF2SO2Cl is used as the HCF2 radical source. Sulfonamides were active nucleophiles in the final step of a tandem addition/oxidation/cyclization process to form pyrrolidines, and esters were found to cyclize to form lactones. Thus, a variety of pyrrolidines and lactones were obtained in moderate to excellent
已经开发出未活化的烯烃的光氧化还原催化的氨基二氟甲基化,其中HCF 2 SO 2 Cl用作HCF 2自由基源。在串联加成/氧化/环化过程的最后步骤中,磺酰胺是活性亲核试剂,以形成吡咯烷,发现酯可环化以形成内酯。因此,以中等至优异的产率获得了各种吡咯烷和内酯。为了使环化反应有效,铜催化剂(Cu(dap)2 Cl)和碳酸银的组合对于抑制竞争的氯二氟烷基化过程至关重要。
Palladium-Catalyzed Intramolecular Aminotrifluoromethoxylation of Alkenes
作者:Chaohuang Chen、Pinhong Chen、Guosheng Liu
DOI:10.1021/jacs.5b10971
日期:2015.12.23
The first catalytic trifluoromethoxylation of unactivated alkenes has been developed, in which Pd(CH3CN)(2)Cl-2 was used as catalyst, AgOCF3 as trifluoromethoxide source, and Selectfluor-BF4 as oxidant. A variety of 3-OCF3 substituted piperidines were selectively obtained in good yields. Direct evidence was provided to address the facile reductive elimination of Pe(IV)-OCF3 complex to form sp(3) C-OCF3 bond.