tert-butyl 2-amino-4-[(1R)-1-({[(6S)-6-(5-chloro-2-methoxybenzyl)-3-(2,2-dimethoxyethylimino)-7-oxo-1,4-diazepan-1-yl]carbonyl}amino)propyl]benzoic acid 、
4-甲基苯磺酸吡啶 在
crude product 、 NH2 silica gel 、
ethyl acetate n-hexane 、
tert-butyl 2-amino-4-[(1R)-1-({[(6S)-6-(5-chloro-2-methoxybenzyl)-7-oxo-6,7-dihydro-5H-imidazo[1,2-a][1,4]diazepin-8(9H)-yl]carbonyl}amino)propyl]benzoate 作用下,
以
1,4-二氧六环 为溶剂,
反应 2.0h,
以to obtain tert-butyl 2-amino-4-[(1R)-1-({[(6S)-6-(5-chloro-2-methoxybenzyl)-7-oxo-6,7-dihydro-5H-imidazo[1,2-a][1,4]diazepin-8(9H)-yl]carbonyl}amino)propyl]benzoate (compound 89b) (33.4 mg)的产率得到tert-butyl 2-amino-4-[(1R)-1-({[(6S)-6-(5-chloro-2-methoxybenzyl)-7-oxo-6,7-dihydro-5H-imidazo[1,2-a][1,4]diazepin-8(9H)-yl]carbonyl}amino)propyl]benzoate