Cross-coupling reactions of haloisoxazoles with olefins and acetylenes.

Palladium catalyst systems for cross-coupling reactions of aryl chlorides and olefins.

A detailed investigation into the influence of phosphines, additives, bases and solvents on the Heck coupling reaction of 4-trifluoromethyl-1-chlorobenzene (2) is presented. It is shown that a number of catalyst systems exist for efficient cross coupling of electron-deficient aryl chlorides with various olefins. Basicity and steric demand of the ligand are two factors which determine the succes...

Solvent-Free Multicomponent Reactions of Dithiocarbamates, Activated Acetylenes and Isocyanides

An efficient method to synthesis the 2H-pyrans using three component reactions of dithiocarbamats, activated acetylenes and isocyanides in water as the solvent is described. In these reactions, synthesis of 2H-pyrans is possible based on the one-pot reaction and without using any catalyst. The mild reaction conditions and high yields of the products exhibit synthetic advantage of these methods.

Alkylboron Cross-Coupling Reactions

The ability to append alkyl moieties onto preexisting molecular scaffolds is of significant interest owing to the breadth of the diversified compounds that can be accessed in late stage synthesis. There are a number of procedures that are capable of incorporating alkyl subunits into organic molecules; however, many of these strategies are limited in scope. In particular, the highly reactive nat...

Increased efficiency in cross-metathesis reactions of sterically hindered olefins.

Efficiency in olefin cross-metathesis reactions is affected upon reducing the steric bulk of N-heterocyclic carbene ligands of ruthenium-based catalysts. For the formation of disubstituted olefins containing one or more allylic substituents, the catalyst bearing N-tolyl groups is more efficient than the corresponding N-mesityl catalyst. In contrast, the formation of trisubstituted olefins is mo...

Copper(I)-Catalyzed Coupling of Terminal Acetylenes with Aryl or Vinyl Halides Copper(I)-Catalyzed Coupling of Terminal Acetylenes