The synthesis of vinyl sulfone derivatives via the reaction of arylpropiolic acids, K2S2O5, and aryl boronic acids is reported. The CuBr2/1,10-phenanthroline catalytic system in the presence of acetic acid provides the desired vinyl sulfones in moderate to good yield. Furthermore, the methodology features excellent functional group tolerance.
报道了通过芳基丙炔酸、K 2 S 2 O 5和芳基硼酸的反应合成乙烯基砜衍生物。在乙酸存在下的 CuBr 2 /1,10-菲咯啉催化体系以中等至良好的产率提供所需的乙烯基砜。此外,该方法具有出色的官能团耐受性。
Radical C(sp<sup>3</sup>)–H alkenylation, alkynylation and allylation of ethers and amides enabled by photocatalysis
作者:Subhasis Paul、Joyram Guin
DOI:10.1039/c7gc00840f
日期:——
enables selective incorporation of alkenyl, alkynyl and allyl functional groups into the C(sp3)–H bond under green reaction conditions is developed. The process is based on the catalytic formation of α-alkoxyl/α-amidyl radicals via the homolytic activation of the C(sp3)–H bond of ethers/amides with a catalytic amount of diarylketone in the presence of a household fluorescent light bulb. This simple reaction
Visible-Light-Mediated Alkenylation of Alkyl Boronic Acids without an External Lewis Base as an Activator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c00399
日期:2021.4.2
Herein we report a protocol for the direct visible-light-mediated alkenylation of alkyl boronic acids at room temperature without an external Lewis base as an activator, and we propose a mechanism involving benzenesulfinate activation of the alkyl boronic acids. The protocol permits the efficient functionalization of a broad range of cyclic and acyclic primary and secondary alkyl boronic acids with
synthon, carbondioxide (CO2) has been extensively used in organic synthesis to produce carboxylic acids. In this research, stereoselective electrochemical carboxylation of α,β-unsaturated sulfones has been developed under transition-metal-free conditions. All the cinnamic acids and the derivatives are obtained selectively in the E-configuration. Besides, arylpropiolates also can be produced from alkynyl
Fragile intermediate identification and reactivity elucidation in electrochemical oxidative α-C(sp<sup>3</sup>)–H functionalization of tertiary amines
作者:Kailun Liang、Dongmei Zhang、Yanming Su、Lijun Lu、Jun Hu、Yi-Hung Chen、Xinxing Zhang、Aiwen Lei、Hong Yi
DOI:10.1039/d3sc00527e
日期:——
cation were successfully detected. Further, the α-amino C(sp3) radical added to the double bond of a phenyl trans-styryl sulfone, yielding another C(sp3) radical that leads to the final vinylation. Based on the massspectrometric elucidation of the reactivity of the α-amino radical, a scale-up electrochemical radical vinylation methodology was established, with which a large variety of allylic amines with