(S)-Benzyl piperidine-2-carboxylate → tert-butyl 2-[(2S)-2-[(benzyloxy)carbonyl]-1-piperidinyl]-1H-1,3-benzimidazole-1-carboxylate

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The title compound was prepared by a similar method to Preparation 2 from tert-butyl 2-chloro-1H-1,3-benzimidazole-1-carboxylate [see Preparation 46] and benzyl (2S)-2-piperidinecarboxylate [see J.A.C.S. (1 996), 118(7), 1629-1644]. The crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 90:10 changing to 80:20, by volume, hexane:ethyl acetate, in 5% increments to afford tert-butyl 2-[(2S)-2-[(benzyloxy)carbonyl]-1-piperidinyl]-1H-1,3-benzimidazole-1-carboxylate as an oil.

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