A process for preparing 3-[(S)-7-bromo-2-(2-oxo-propylamino)-5-pyridin-2-yl-3H-1,4,-benzodiazepin-3-yl]propionic acid methyl ester at a high conversion rate with good reproducibility by oxidizing 3-[(S)-7-bromo-2-(2-hydroxy-propylamino)-5-pyridin-2-yl-3H-benzo[e][1,4]diazepin-3-yl]propionic acid methyl ester in the presence of an oxidation catalyst is provided by defining the ammonium ion content of 3-[(S)-7-bromo-2-(2-hydroxy-propylamino)-5-pyridin-2-yl-3H-benzo[e][1,4]diazepin-3-yl]propionic acid methyl ester.
一种制备 3-[(S)-7-
溴-2-(2-氧代-丙基
氨基)-5-
吡啶-2-基-3H-1,4,-
苯并二氮杂卓-3-基]
丙酸甲酯的工艺,在氧化催化剂存在下,通过确定 3-[(S)-7-
溴-2-(2-羟基-丙基
氨基)-5-
吡啶-2-基-3H-苯并[e][1、(S)-7-
溴-2-(2-羟基-丙基
氨基)-5-
吡啶-2-基-3H-苯并[e][1,4]二氮杂卓-3-基]
丙酸甲酯的
铵离子含量。