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[a] NaHMDS, THF, −78 °C, PhSeCl, 0 °C, then aq. H2O2, 98%; [b] DIBAL, −78 °C, 95%; [c] sodium naphthalide, THF, −78 °C, 1 min, then MnO2, PhH, 70%; [d] TsOH (cat.), ClCH2CH2Cl, 92%; [e] tBuOCl, aq. acetone, 40%; [f] air oxidation; [g] CH2Cl2; aq. NaHSO3 (95%).
