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aReagents: (a) i) C6H5CHO, EtOH, KOH; ii) NaBH4, CeCl3, EtOH, 0 °C; iii) Ac2O, Et3N, DMAP (91–97% overall); (b) i) O3, MeOH/EtOAc, −78 °C, ii) Me2S (82–98% overall); (c) i) Jones reagent; ii) SmI2,THF (under N2) (70–94%); (d) K2CO3, MeOH/H2O (93-98%).
