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Synthesis of 3-carboxamide 9-pentyl-9H-pyrido[3,4-b]indole derivatives 33-35.a
a Reagents and conditions: (a) n-pentyl bromide, Cs2CO3, DMF, μw at 140°C, 1 h; (b) KOH, ethanol/water, reflux, 16h; (c) DIEA, DMAP, corresponding amine, EDAC·HCl, DCM, 0°C → rt, 16 h.
