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Synthetic route for compound 4d. Reagents and Conditions: (i) ethanol/reflux 3 h, 74%; (ii) ethanol/TEA/reflux 5 h, good yield 60%–71%; (iii) Butanol/reflux 5 h, with a poor yield of 35%–40%; (iv) MW irradiation (W 250 and T 150 °C) for 15 min, with a poor yield of 35%–45%.
