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Reagents and conditions: (a)673 TFA, CHCl3; (b)674 NBS (5 equiv), CHCl3; (c)675 NBS (1.9 equiv), CHCl3; (d)674 (1) phenylboronic acid, Pd(PPh3)4, K2CO3, (2) TFA, NaHCO3, (3) Zn(OAc)2·2H2O; (e)675 2,4,6-trimethylphenylboronic acid, Pd(PPh3)4, K2CO3; (f)675 TFA, CHCl3.
