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Synthetic overview of our work. Reagents and conditions: (i) POCl3 (excess), MW (150 W; 150 °C), 30 min; (ii) alkyldiamine (2.5 equiv.), NaI (10% w/w), phenol (5 equiv.), MW (150 W; 150 °C), 30 min; (iii) acetic anhydride (excess), CH3OH, H2SO4 (2–3 drops), MW (50 W; 100 °C), 10 min; (iv) DMF (excess), Et3N (3 equiv.), MW (150 W; 120 °C), 30 min; (v) 2,5-dichloro-1,4-benzoquinone (0.5 equiv.), Na2CO3 (3 equiv.), EtOH, rt, 2–3 h.
