3,4-DISUBSTITUTED AZETIDIN-2-ONE DERIVATIVES USEFUL AS CYSTEINE PROTEINASE REGULATORS

摘要

The present invention is based on the discovery that certain 3,4-disubstituted-azetidin-2-one derivatives exhibit excellent cysteine proteinase inhibitory activity which can be used for treatment of different diseases such as muscular dystrophy, myocardial infarction, bone resorption, arthritis, cancer metastatis, pulmonary emphysema, septic shock, cerebral ischemia, memory function, Alzheimer and cataract, malaria, glomerular basement membrane degradation, bacterial infection, inflammatory diseases, parasitic infections, and viral infections. In accordance with the present invention, there is provided a 3,4-disubstituted-azetidin-2-one derivatives of formula (I), wherein R1, R2 and R3 are as defined herein, or a pharmaceutically acceptable salt thereof.