Carbomethoxydifluoromethylation of enol acetates with methyl (chlorosulfonyl)difluoroacetate using visible-light photoredox catalysis. Synthesis of 2,2-difluoro-γ-ketoesters
摘要:
In a visible light, room temperature photoredox catalytic process using 0.5 mol% of a Ir[(dF(CF3)p-py)(2)(dtbbpy)]PF6 catalyst, a general method for attaching a carbomethoxydifluoromethyl group to the alpha position of a ketone, using the reaction of methyl (chlorosulfonyl)difluoroacetate (MCDA) with enol acetates, is reported. This method allows the synthesis of a variety of 2,2-difluoro-gamma-ketoesters in moderate to very good yields. (C) 2015 Elsevier B.V. All rights reserved.
Anionic Bisoxazoline Ligands Enable Copper‐Catalyzed Asymmetric Radical Azidation of Acrylamides
作者:Lianqian Wu、Zhihan Zhang、Dunqi Wu、Fei Wang、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1002/anie.202015083
日期:2021.3.22
Asymmetric radicalazidation for the synthesis of chiral alkylazides remains a tremendous challenge in organic synthesis. We report here an unprecedented highly enantioselective radicalazidation of acrylamides catalyzed by 1 mol % of a copper catalyst. The substrates were converted to the corresponding alkylazides in high yield with good‐to‐excellent enantioselectivity. Notably, employing an anionic
Interrupted reduction of CF 3 SO 2 Cl using tricyclohexylphosphine allows for electrophilic trifluoromethylsulfinylation
作者:Hélène Chachignon、Dominique Cahard
DOI:10.1016/j.jfluchem.2016.11.020
日期:2017.6
The monoreduction of trifluoromethanesulfonyl chloride by an appropriate phosphine, preferentially tricyclohexylphosphine, generates the reactive trifluoromethanesulfinyl chloride CF3SOCl as donor of CF3S(O)+ cation. The direct trifluoromethylsulfinylation of indoles, pyrroles, other azaarenes, amines, and phenols was successfully achieved in moderate to high yields.
Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Three-Component Radical-Initiated 1,2-Dicarbofunctionalization of Alkenes
作者:Jin-Shun Lin、Tao-Tao Li、Ji-Ren Liu、Guan-Yuan Jiao、Qiang-Shuai Gu、Jiang-Tao Cheng、Yu-Long Guo、Xin Hong、Xin-Yuan Liu
DOI:10.1021/jacs.8b11736
日期:2019.1.16
copper(I) and chiral phosphoric acid cooperative catalysis strategy has been developed, providing straightforward access to chiral triarylmethanes bearingquaternaryall-carbonstereocenters with high efficiency as well as excellent chemo- and enantioselectivity. The key to success is not only the introduction of a sterically demanding chiral phosphoric acid to favor radical difunctionalization over the
Radical-Mediated 1,2-Formyl/Carbonyl Functionalization of Alkenes and Application to the Construction of Medium-Sized Rings
作者:Zhong-Liang Li、Xiao-Hua Li、Na Wang、Ning-Yuan Yang、Xin-Yuan Liu
DOI:10.1002/anie.201608198
日期:2016.11.21
A novel radical 1,2‐formylfunctionalization of alkenes involving 1,2(4,5)‐formyl migration triggered by addition of various carbon‐ and heteroatom‐centered radicals to alkenes has been developed for the first time, thus providing straightforward access to diverse β‐functionalized aldehydes with good efficiency, remarkable selectivity, and excellent functional group tolerance. Analogous transformations
Catalytic Diverse Radical-Mediated 1,2-Cyanofunctionalization of Unactivated Alkenes via Synergistic Remote Cyano Migration and Protected Strategies
作者:Na Wang、Lei Li、Zhong-Liang Li、Ning-Yuan Yang、Zhen Guo、Hong-Xia Zhang、Xin-Yuan Liu
DOI:10.1021/acs.orglett.6b02960
日期:2016.12.2
2-cyanofunctionalization of unactivatedalkenes involving remote cyano migration triggered by addition of diverse carbon- and heteroatom-centered radicals to alkenes has been developed. This powerful strategy provides a diverse platform for the collection of a variety of synthetically important β-functionalized alkyl nitriles bearing densely functionalized carbonyl, cyano, and other various functional groups within