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Reagents and conditions: (a) 4-amino-1-methylpiperidine, HBTU, Et3N, DMF, RT, 16 h; (b) SnCl2·2H2O, EtOAc/ethanol, 10:3, 50 °C, 16 h; (c) 24–33, c. HCl, EtOH/dioxane/H2O, 1:1:1, 100 °C, 24–48 h; (d) 4-amino-1-methylpiperidine, EDCI·HCl, HOBt·H2O, Et3N, CH3CN, RT, 16 h.
