The preparation of (E)-1-methyl-4-(2-methylsulfonyl)vinylpyridinium iodide and its reaction with thiols are described. Its properties as a new affinity chromophoric label are reported.
(E)-1-Alkyl-4-[2-(alkylsulfonyl)-1-ethenyl]pyridinium Salts: Reaction with Thiol Groups Giving Rise to Chromophoric (E)-1-Alkyl-4-[2-(alkylsulfanyl)-1-ethenyl]pyridinium Salts
作者:Michel Holler、Hong Sig Sin、Antony James、Alain Burger、Denis Tritsch、Jean-François Biellmann
-ethenyl]pyridinium iodide, prepared from the corresponding thioether by reaction with methyliodide in diethyl ether, underwent isomerization to the E isomer in a first-order reaction in deuterated [D6]DMSO with an activation energy of 14 kcalmol(-1). At pH 7, the (E)-1-methyl-4-[2-(methylsulfonyl)-1-ethenyl]pyridinium iodide (19) reacted specifically with thiols. The reaction of this sulfone with
Direct Photoexcitation of Xanthate Anions for Deoxygenative Alkenylation of Alcohols
作者:Hong-Mei Guo、Bin-Qing He、Xuesong Wu
DOI:10.1021/acs.orglett.2c00889
日期:2022.5.6
In this report, we identify xanthate salts as a unique class of visible-light-excitable alkyl radical precursors that act simultaneously as strong photoreductants and alkyl radical sources. Upon direct photoexcitation of xanthate anions, efficient deoxygenative alkenylation and alkylation of a wide range of primary, secondary, and tertiary alcohols have been achieved via a one-pot protocol, avoiding
Heck Vinylations Using Vinyl Sulfide, Vinyl Sulfoxide, Vinyl Sulfone, or Vinyl Sulfonate Derivatives and Aryl Bromides Catalyzed by a Palladium Complex Derived from a Tetraphosphine
affords an efficient catalyst for the Heck reaction ofsulfur-containing alkenes with aryl bromides. The rates and yields of the reactions strongly depend on the oxidation state of the sulfur atom. Using vinyl sulfides with 1 mol% catalyst, low to moderate yields of arylated alkenes were obtained. Phenyl vinyl sulfoxide was found to be more reactive, and satisfactory yields of (E)-[2-(phenylsulfinyl)vinyl]benzene
The preparation of (E)-1-methyl-4-(2-methylsulfonyl)vinylpyridinium iodide and its reaction with thiols are described. Its properties as a new affinity chromophoric label are reported.