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Reagents and conditions: (a)655 Palau′Chlor, CHCl3, rt, 6 h; (b)655 Ni(cod)2, 1,5-cyclooctadiene, DMF, 100 °C, 9 h; (c)655 DDQ, Sc(OTf)3, toluene, 80 °C, 2 h; (d)655 DDQ, Sc(OTf)3, toluene, 60 °C, 1 h; (e)656 H2O2, NaWO4·2H2O, MeN(nOct)3·HSO4, PhP(O)(OH)2, toluene, 50 °C, 13 h; (f)656 AuCl3, AgOTf, (CHCl2)2, 80 °C, 30 min.
