Scheme 3.
Synthesis of compound (9). Reagents and conditions: (i) MeONa (1 M), then ethanoic acid (AcOH), 83%; (ii) benzyl bromide (BnBr), NaH, dimethylformamide (DMF), 65%; (iii) tetrabutylammonium fluoride (TBAF), tetrahydrofuran (THF), 87%.
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