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Reagents and conditions: (a) HATU, DIPEA, CH2Cl2, rt, 40 min; (b) 4 N HCl/DOX, rt, 30 min; (c) HATU, DIPEA, CH2Cl2, rt, 40 min; (d) Fe/NH4Cl, EtOH/H2O, reflux, 2 h; (e) picolinoyl chloride, DIPEA, DMAP, DMF, rt, 40 min; (f) IBX, EtOAc-DMSO, reflux, 3 h.
