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Reagent and conditions for synthesis of curcumin derivatives 4c, 4d, and 6–8: (A) 4a, CH3I, K2CO3, acetone, reflux; (B): 4a, BBr3, –78 °C to ambient temperature, N2 (g), H2O; (C) 4a, H2/Pd-C (10 wt. % of palladium), MeOH, 0 °C to ambient temperature; (D) 4a, Ac2O, DMAP, pyridine, ambient temperature; (E) 4a, NH2NH2 .H2O, AcOH, reflux.
