endo-tert-butyl (1R,5S)-3-[(3-aminopyridin-2-yl)amino]-8-azabicyclo[3.2.1]octane-8-carboxylate 、
原乙酸三乙酯 在
camphor-10-sulfonic acid 作用下,
反应 3.0h,
以80%的产率得到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