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Reagents and conditions: (a) P(OEt)3, 130 °C, overnight, 78%; (b) sat. NH3/EtOH, rt, 4 d, 44%; (c) TMSI, CH2Cl2, rt, 9 h, 63%; (d) tributyl (1-ethoxyvinyl) stannane, Pd(PhP3)2Cl2, THF, 80 °C, 24 h, 54%; (e) Cat. NaOMe, CH3OH, rt, 12 h, 79%.
