Electrosynthesis of (<i>E</i>)-Vinyl Sulfones Directly from Cinnamic Acids and Sodium Sulfinates via Decarboxylative Sulfono Functionalization
作者:Peng Qian、Meixiang Bi、Jihu Su、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.joc.6b00661
日期:2016.6.3
A variety of (E)-vinyl sulfones were constructed directly from cinnamic acids and sodium sulfinates with high regioselectivity at room temperature by virtue of an electrocatalytic oxidation. A radical intermediate was detected, and the corresponding mechanism was investigated.
Intermolecular [2 + 2] Photocycloaddition of α,β-Unsaturated Sulfones: Catalyst-Free Reaction and Catalytic Variants
作者:Noah Jeremias、Lisa-Marie Mohr、Thorsten Bach
DOI:10.1021/acs.orglett.1c01794
日期:2021.8.6
2-Aryl-1-sulfonyl-substituted cyclobutanes were prepared in an intermolecular [2 + 2] photocycloaddition from various α,β-unsaturated sulfones and olefins upon irradiation at λ = 300 nm (26 examples, 60–99% yield). Lewisacids catalyzed the [2 + 2] photocycloaddition of 2-benzimidazolyl styryl sulfones. At short wavelengths, the latter substrates underwent C–S bond cleavage but AlBr3 (5 mol %) allowed
作者:David C. Forbes、Mike S. South、Rajesh Rengasamy、Adirika J. Obiako、David R. Battiste
DOI:10.1080/17415993.2015.1043303
日期:2015.7.4
A study involving scope in the condensation reaction of phenylsulfonylacetic acid with a series of carbonyl derivatives has been conducted. Reactivity trends favor formation of the corresponding vinyl sulfones when working with arylaldehydes. Electron-deficient arylaldehydes outperform electron-rich arylaldehydes. Negligible differences were noted when using electron-rich and electron-deficient
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
Photoredox α-Vinylation of α-Amino Acids and <i>N</i>-Aryl Amines
作者:Adam Noble、David W. C. MacMillan
DOI:10.1021/ja506094d
日期:2014.8.20
union of vinyl sulfones with photoredox-generated α-amino radicals to provide allylicamines of broad diversity. Direct C–H vinylations of N-aryl tertiaryamines, as well as decarboxylative vinylations of N-Boc α-amino acids, proceed in high yield and with excellent olefin geometry control. The utility of this new allyl amine forming reaction has been demonstrated via the syntheses of several natural