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Reagents and conditions: (a)555t-BuOK (1 equiv), DMF, 0 °C, 1 h; (b) neat, N2, 230 °C, 3 h; (c) [Rh(cod)Cl]2 (5 mol %), P(Oi-Pr)3 (0.1 equiv), i-Pr3SiH (4 equiv), ethylcyclohexane, reflux, 15 h; (d) IrCl3, dry ethylene glycol, N2, reflux, 24 h; (e) EtOH/AcOH (1:1), reflux, 24 h; (f) acetylacetone, pyridine, reflux, 24 h; (g) K2PtCl4, 2-ethoxyethanol/H2O (3:1), N2, 80 °C, 24 h.
