摘要
A new and improved synthetic route to N-(4-chloro-3-cyano-7-ethoxyquinolin-6-yl)acetamide (1) is described on a kilogram scale. The key step is the basic cyclization of o-[(2-cyanovinyl)amino]benzoate (14) in (BuONa)-Bu-t/(BuOH)-Bu-t system to give the 3-cyano-4-hydroxyquinoline (7). The final product 1 is obtained with 49% overall yield (seven steps) and 98.9% purity (HPLC), which makes it a cost-effective and commercially friendly process for scale-up operations.
- 出版日期2012-12
- 单位中国科学院上海药物研究所