Domino metathesis of alkynyl substituted cycloolefins

Cycloolefins with N- and O-propargyl side chains were converted in good yields to disubstituted dihydropyrroles and dihydrofurans using Grubbs’ catalyst in a sequence of enyne metathesis, RCM–ROM and CM. Olefins employed in the final CM step were ethylene and various monosubstituted alkenes.