Selective ruthenium-catalyzed hydrochlorination of alkynes: one-step synthesis of vinylchlorides.
An unprecedented ruthenium-catalyzed direct and selective alkyne hydrochlorination is reported and leads to vinylchlorides in excellent yields with atom economy. The reaction proceeds at room temperature from terminal alkynes and provides a variety of chloroalkenes. Only the regioisomer resulting from the formal Markovnikov addition is selectively formed. Mechanistic studies show the stereoselective syn addition of HCl to alkynes at room temperature and suggest a chloro hydrido Ru(IV) species as a key intermediate of the reaction.
Institut des Sciences Chimiques de Rennes-UMR 6226, CNRS-Université de Rennes 1, Campus de Beaulieu 35042 Rennes (France). sylvie.derien@univ-rennes1.fr.
Sylvie
S
Dérien
Institut des Sciences Chimiques de Rennes-UMR 6226, CNRS-Université de Rennes 1, Campus de Beaulieu 35042 Rennes (France).
Hubert
H
Klein
Institut des Sciences Chimiques de Rennes-UMR 6226, CNRS-Université de Rennes 1, Campus de Beaulieu 35042 Rennes (France).
Christian
C
Bruneau
alkenes; alkynes; hydrohalogenation; ruthenium; synthetic methods