Cycloolefins with N- and O-propargyl side chains were converted in good yie
lds to disubstituted dihydropyrroles and dihydrofurans using Grubbs' cataly
st in a sequence of enyne metathesis, RCM-ROM and CM. Olefins employed in t
he final CM step were ethylene and various monosubstituted alkenes. (C) 200
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