endo-tert-butyl (1R,5S)-3-(2-ethoxy-2-methyl-1,2-dihydro-3H-imidazo[4,5-b]pyridin-3-yl)-8-azabicyclo[3.2.1]octane-8-carboxylate 在
camphor-10-sulfonic acid 作用下,
以
N-甲基吡咯烷酮 为溶剂,
反应 12.0h,
以68%的产率得到endo-tert-butyl (1R,5S)-3-(2-methyl-3H-imidazo[4,5-b]pyridin-3-yl)-8-azabicyclo[3.2.1]octane-8-carboxylate