Dr. Tomohiro Iwai, Hiori Okochi, Dr. Hideto Ito and Prof. Dr. Masaya Sawamura Construction of Eight-Membered Carbocycles through Gold Catalysis with Acetylene-Tethered Silyl Enol Ethers Angewandte Chemie International Edition 52
Semihollow triethynylphosphanes were synthesized and employed as ligands in the gold-catalyzed 8-exo-dig cyclization of acetylene-tethered silyl enol ethers to obtain eight-membered-ring carbocycles (see scheme). The gold–phosphane catalysts promoted either the annulation toward bicyclic structures or the cyclization of acyclic molecules to form nonfused carbocycles. Tf=Trifluoromethylsulfonyl.
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