Acetic Acid → 4-[[N-(2-(tert-butoxycarbonylamino)-4,5-difluorobenzoyl)glycyl]aminomethyl]-1-(4-hydroxy-3-nitrobenzyl)piperidine

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To a mixture of 4-[{N-(2-(tert-butoxycarbonylamino)-4,5-difluorobenzoyl)glycyl}aminomethyl]piperidine (0.35 mmol), 4-hydroxy-3-nitrobenzaldehyde (1.22 mmol), methanol (3.8 mL), and acetic acid (0.175 mL) was added NaBH3CN (1.58 mmol) in methanol (3.2 mL). The reaction mixture was stirred at 50° C. overnight. The mixture was cooled to room temperature, loaded onto Variant™ SCX column, and washed with CH3OH. Product was eluted off using 2 N NH3 in CH3OH and concentrated. The resulting material was dissolved into ethyl acetate/methanol=5/1, loaded onto Varian™ Si column, eluted off using ethyl acetate/methanol 5/1 (10 mL), and concentrated to give 4-[{N-(2-(tert-butoxycarbonylamino)-4,5-difluorobenzoyl)glycyl}aminomethyl]-1-(4-hydroxy-3-nitrobenzyl)piperidine (175 mg, 87%).

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