A New Methodology for Obtaining α-Oxo Ester Equivalents: Sulfanylation of α-Sulfonyl Carboxylic Esters in a Solid/Liquid Phase Transfer Catalytic System
Selective Sulfenylative Desulfonylation or Decarbalkoxylation of <font>α</font>-Sulfonyl Malonates with DABCO or Bu<sub>3</sub>N: Reactivity and Conformational Analysis
作者:Claudio L. Donnici、Elaine Henriques Teixeira Pereira、Júlio C. Dias Lopes、Liliana Marzorati、Blanka Wladislaw
DOI:10.1080/00397910902962852
日期:2010.1.14
reactivity of several α-substituted α-sulfonyl malonates toward 1,4-diazabicyclo[2.2.2]octane (DABCO) and Bu3N is described. The reactivity with DABCO revealed the possible competition between decarbalkoxylation and unexpected desulfonylation, depending on the α-substituent, because of sterical hindrance around the electrophilic centers (SO2 and CO2R). The derivatives with crowded α-substituents suffer
A General Protocol for C−H Difluoromethylation of Carbon Acids with TMSCF
<sub>2</sub>
Br
作者:Qiqiang Xie、Ziyue Zhu、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201900763
日期:2019.5.6
efficient method for the selectiveC‐difluoromethylation of carbon acids with the reagent TMSCF2Br has been developed. A variety of structurally diverse sp3‐ and sp‐hybridized carbon nucleophiles, including esters, amides, fluorenes, terminal alkynes, β‐ketoesters, malonates, and other activated C−H nucleophiles, could be efficiently and selectively transformed into the corresponding C‐difluoromethylated
Formal aromatic C−Hinsertion of rhodium(II) carbenoid was intensively investigated to develop a new methodology and probe its mechanism. Contrasting with the previously proposed directC−Hinsertion, the mechanism was revealed to be electrophilic aromatic substitution, which was supported by substituent effects on the aromatic ring and a secondary deuterium kinetic isotope effect. Various isoquinolinones
NEW DECARBOXYLATIVE SULFANYLATION OF SOME PHENYLSULFONYL ARYLACETIC ACIDS
作者:Blanka Wladislaw、Liliana Marzorati、Claudio Di Vitta、Nelson F. Claro
DOI:10.1080/10426500008042091
日期:2000.6.1
Abstract The reaction of some α-phenylsulfonyl arylaceticacids with NaH in DMSO and dimethyl disulfide leading to α-sulfanylated benzyl phenyl sulfones is discussed.
摘要 讨论了一些 α-苯磺酰基芳基乙酸与 NaH 在 DMSO 和二甲基二硫醚中反应生成 α-磺酰基化苄基苯砜。
Easy access to α-carbonyl sulfones using cross-coupling of α-aryl-α-diazoesters with sulfonyl hydrazides
Cu-catalyzed cross-coupling of α-aryl-α-diazoesters with sulfonyl hydrazides is explored to access α-carbonyl sulfones via migratory insertion of Cu-carbene species.