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Reagents and conditions: (a) Benzyl bromide, potassium tert-butoxide, DMF, 130 °C, overnight; (b) TFA/DCM (1/3, v/v), triisopropylsilane, 3 h, RT; (c) triphosgene, 4-amino-1-Boc-piperidine, TEA (to pH 8), THF, reflux, 1 h; (d) MeOH/HCl 2 M (1/1, v/v), reflux, 3 h.
