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Synthesis of compound 12.
Reagents and conditions: (a) potassium carbonate, benzyl bromide, acetone, 15 h, rt, 73%; (b) perchloric acid, thallium trinitrate, THF/MeOH (1/5), 18 h, rt then palladium 10% on carbon, ammonium formate, MeOH, 4 h, rt, 51% two steps; (c) N-bromosuccinimide, p-toluenesulfonic acid, MeOH, 3 h, 40 °C, ultrasonic bath, 73%.
