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Synthesis of compound 18. Reagents and conditions: (a) benzoyl chloride, TEA, THF, 0 °C to rt, 2 h, 91%; (b) acetyl chloride, SnCl4, anhydrous DCM, 0 °C to rt, 5 h, 45%; (c) KOH, anhydrous 1,4-dioxane, reflux, 4 h, 35%; (d) BBr3/DCM, DCM, −10 °C to rt, 24 h, 75%.
