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-benzoylphenyl)-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,特别是采用2-(烷基
硫)乙酰胺在亚
磺酸氯的存在下处理2-
氨基苯基酮,以得到2-(2-
氨基-3-苯甲酰基苯基)-2-(烷基
硫)乙酰胺,还原后得到Nepafenac。本文还描述了Nepafenac的纯化过程,特别是去除结构相似的杂质。