The present invention provides compounds of formula I: or a pharmaceutically acceptable salt thereof. Compounds of formula I are inhibitors of Janus kinases and as such are useful for the treatment of various diseases and conditions mediated by said enzymes, such as rheumatoid arthritis, asthma, COPD, ALS, and the like.
本发明提供了式I的化合物:或其药学上可接受的盐。式I的化合物是Janus激酶的
抑制剂,因此可用于治疗由该酶介导的各种疾病和病症,如类风湿性关节炎、哮喘、慢性阻塞性肺疾病、肌萎缩侧索硬化症等。