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Reagents and conditions: (a) piperidine, 2-(7-aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU), Et3N, dimethylformamide (DMF), rt, 10 h; (b) 1 mol/L LiOH aqueous solution, CH3OH, rt, 3 h.
