Described herein are processes for the preparation of nepafenac and related intermediates, particularly wherein 2-aminobenzophenone is treated with a 2-(alkylthio)acetamide in the presence of sulfuryl chloride to afford a 2-(2-amino-3-benzoyl-phenyl)-2-(alkylthio)acetamide, which upon reduction affords nepafenac. Described herein are also processes for the purification of nepafenac, particularly for the removal of structurally similar impurities.
本文描述了制备Nepafenac及其相关
中间体的过程,特别是在
硫酰氯存在下将2-
氨基
苯基
酮与2-(烷基
硫基)乙
酰胺反应,得到2-(2-
氨基-3-
苯甲酰基
苯基)-2-(烷基
硫基)乙
酰胺,再经还原制得Nepafenac。本文还描述了Nepafenac的纯化过程,特别是去除结构类似的
杂质。