Annelated Cyclobutanes by Fe-Catalyzed Cycloisomerization of Enyne Acetates

摘要

Cationic Fe complexes of the general type [(Ph3P)(2)Fe(CO)(NO)]X (X=BF4, BAr4F) catalyze the redox-neutral cycloisomerization of 1,6- and 1,7-enyneacetates to afford bicyclic cyclobutanes under mild conditions in good yields and diastereoselectivities.