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aReagents and conditions: (a) PhSO2Cl, NaH, THF, 0 °C to rt; (b) NH4OH, glyoxal, ethanol, reflux; (c) i) NBS, THF, 0 °C to rt; ii) SEMCl, NaH, THF; (d) 8, i-PrMgCl(LiCl), THF, rt to reflux; (e) Pd(OAc)2, K2CO3, PPh3, n-BuOH, reflux; (f) TFA, DCM, rt.
