“…(281)) [1362]. Gold, copper, and platinum catalyzed a [4 + 2]cycloisomerization of 1,9-diyne-6-ones, 1,10-diyne-7-ones, 1,6-diyne-10-als, 1,9-enyne-6-ones, 1,10-enyne-7-ones, and 1,6-enyne-10-als to give polycyclic compounds [1363,1364]. This reaction was used in a synthesis of (+)-ochromycinone and (+)-rubiginone B 2 (Eq.…”