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Reagents and conditions: (a) PhSO2Cl, Hunig’s base, CH2Cl2, −78 °C to RT; (b) Dess–Martin periodinane, CH2Cl2, 0 °C; (c) K2CO3, 18-crown-6, (2-nitrobenzyl)triphenylphosphonium bromide, DME, RT; (d) Pearlman’s catalyst, H2 balloon, CF3CH2OH, RT; (e) 3,3-Bis(4-fluorophenyl)propanoic acid, T3P, Hunig’s base, EtOAc, RT; (f) TFA, CH2Cl2, RT, then Chiralpak AD.
