β,β‘- and α,β,β‘-Annulation Reactions of Cyclic Enamines:  Enantioselective Synthesis of Bicyclo[3.<i>n</i>.1]alkenones (<i>n</i> = 2, 3) and Tricyclo[3.3.0.0<sup>2,8</sup>]octanes from Fischer Alkenyl Carbene Complexes

β,β‘- and α,β,β‘-Annulation Reactions of Cyclic Enamines:  Enantioselective Synthesis of Bicyclo[3.<i>n</i>.1]alkenones (<i>n</i> = 2, 3) and Tricyclo[3.3.0.0<sup>2,8</sup>]octanes from Fischer Alkenyl Carbene Complexes