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Synthesis of novel indazole scaffolds and the corresponding acyl derivatives, reagents and conditions: (a) NH4Cl, PyBOP, DIPEA, DMF, rt, 12 h (83%); (b) EDC × HCl, HOAt, DMF, rt, 3 h (5f: 64%, 5g: 53%, F-5g: 45%); (c) N2H4, BuOH, 120 °C, 4 h (69%).
