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Chiral gold(I)‐cavitand complexes have been developed for the enantioselective alkoxycyclization of 1,6‐enynes. This enantioselective cyclization has been applied for the first total synthesis of carbazole alkaloid (+)‐mafaicheenamine C and its enantiomer, establishing its configuration as R. The cavity effect was also evaluated in the cycloisomerization of dienynes. A combination of experiments and theoretical studies demonstrates that the cavity of the gold(I) complexes forces the enynes to adopt constrained conformations, which results in the high observed regio‐ and stereoselectivities.

Enantioselective Alkoxycyclization of 1,6‐Enynes with Gold(I)‐Cavitands: Total Synthesis of Mafaicheenamine C