CuI/N,N-Dimethylglycine-Catalyzed Coupling of Vinyl Halides with Amides or Carbamates
摘要:
The Cul-catalyzed coupling reaction of vinyl halides with amides or carbamates proceeds well at room temperature to 80 degreesC in dioxane to give enamides using NN-dimethylglycine as the promoter and Cs2CO3 as the base. The geometry of the C-C double bond is retained during the reaction course.
terminal and non-terminal alkenes such as enol esters, alkenyl sulfides, enol ethers, silyl enol ethers, enamides and enecarbamates has been developed. The reactions are carried out at room temperature under air initiation in the presence of triethylborane acting as a chain transfer reagent and 4-tert-butylcatechol (TBC) as a source of hydrogen atom. The efficacy of the reaction is best explained by very
The addition of xanthates and vinyldisulfones across the double bond of enamides and ene-carbamates provides access to the corresponding three.. component adducts in good to excellent yields with a high level of diastereocontrol in cyclic systems. This strategy illustrates a complementary reactivity for these versatile olefins and extends their scope of application.