The present invention provides the compound of Formulas I, is JAK inhibitor, and the treatment of disease, such as rheumatoid arthritis, asthma, COPD and cancer that these compounds are mediated with what JAK.本發明提供式I的化合物,其爲JAK抑制劑,且這些化合物用於JAK介導的疾病、如類風濕性關節炎、哮喘、COPD和癌症的治療。