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Reagents and conditions: (a) acetic anhydride, reflux; (b) di-tert-butyldicarbonate, CH3CN, reflux; (c) 1. POCl3, DMF; 2. 1 N NaOH; (d) 4-acetylpyridine, MeOH, reflux; (e) 2f, TFA/MeOH.
