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Synthesis of target compounds. Reagents and conditions: (a) substituted bromobenzene, NaH, DMF, Ar2, 0 °C-rt, 3 h; (b) (CO)2Cl, MeOH, 0 °C, overnight; (c) TBTU, Et3N, DCM, 0 °C-rt, overnight; (d) NH2OK, MeOH, 2 h; (e) NH2NH2.H2O, MeOH, reflux, 12–48 h; (f) aliphatic aldehydes, NaBH4, rt, 4 h.
