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Reagents and conditions: 30: (a) NH2NH2, pyridine, rt, 2.5 h, 41%; (b) EtOH, 80 °C, 2 h, 95%; (c) NBS, CHCl3, 60 °C, 3 h, 50%. 33: (a) 35% NH2NH2·H2O, 65 °C, 12 h, 75%; (b) EtOH, 80 °C, 2 h, 62%; (c) NBS, CHCl3, 60 °C, 2.5 h, 59%. 36: (a) i) NaOH/H2O, extraction with Et2O, ii) NH2NH2·H2O, EtOH, 100 °C, 16 h, 37%; (b) pyridine, EtOH, 80 °C, 2 h, 98%; (c) NBS, CHCl3, 60 °C, 24 h, 93%.
