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Reagents and conditions: (a) SEM-Cl, NaH, DMF, 0–21 °C, 2 h; (b) 4, Pd(OAc)2, K3PO4, P(Cy)3, PhMe/H2O, 80 °C, 16 h; (c) CF3COOH, CH2Cl2, then NaOAc, EtOH, 21 °C, 24 h; (d) aq NaOH, MeOH, 75 °C, 1 h, then aq HCl.
