(Z)-(2S)-2-[amino([2-(1-[(benzyloxy)carbonyl]-4-piperidyloxy)acetyl]oxyimino)methyl]-1-piperidinecarboxylate 在
tert-butyl (2S)-2-{5-[(1-[(benzyloxy)carbonyl]-4-piperidyloxy)methyl]-1,2,4-oxadiazol-3-yl}-1-piperidinecarboxylate 、 crude product 、 silica gel 、
乙酸乙酯 作用下,
以
吡啶 为溶剂,
以ethyl acetate, in 5% increments, to afford tert-butyl (2S)-2-{5-[(1-[(benzyloxy)carbonyl]-4-piperidyloxy)methyl]-1,2,4-oxadiazol-3-yl}-1-piperidinecarboxylate的产率得到tert-butyl (2S)-2-{5-[(1-[(benzyloxy)carbonyl]-4-piperidyloxy)methyl]-1,2,4-oxadiazol-3-yl}-1-piperidinecarboxylate