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Reagent and conditions: (a) Br2, CHCI3, 0°C, (b) CF3C02Ag, l2, (c) DIBAL, CH2CI2, (d) EDCI, DMAP, CH2CI2, CH3(CH2)2C02H for 32, and PhC02H for 33, (e) KOH, EtOH, reflux, (f) Ac20, reflux, (g) NaBH4, THF, MeOH
