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The synthesis of compounds 19a‒v. Reagents and conditions: (a) various dibromoalkanes, DMF, K2CO3, overnight, r.t.; (b) hydroxyl-substituted analogues, DMF, K2CO3, r.t., or 80 °C, 8 h; (c) 2-amino-4,6-dimethoxybenzamide, DMAC, PTSA, NaHSO3, 120 °C, 16–20 h.
