Rhodium(I)-Ctalyzed 'Metallo-Ene' Cyclizations/β-Eliminations

Article abstract of DOI:10.1002/hlca.19930760618

Octadienyl carbonates 5 provide cyclic 1,4-dienes 6 when treated with Rh^I complexes (1-10 mol-percent) at 80 deg C.Similar cyclization of cyclohexenyl acetate 8 affords cis-fused hexahydroindene 9.Analogues ring closures of nonadiene carbonate 10 yield preferably the cis-divinylpyrrolidine 11 with Rh^I catalysis but the trans-isomer 12 when catalyzed by Pd⁰.Azaoctadienyl carbonate 5a undergoes elimination with (5 mol-percent, 80 deg C) in MeCN giving acyclic triene 7.