| abstract |
A compound of Formula I, enantiomers, diastereomers, tautomers or pharmaceutically acceptable salts thereof, wherein R 1 , R 2 , R 3 , R 4 and R 5 are defined herein, are useful as JAK kinase inhibitors. A pharmaceutical composition that includes a compound of Formula I and a pharmaceutically acceptable carrier, adjuvant or vehicle, and methods of treating or lessening the severity of a disease or condition responsive to the inhibition of JAK kinase activity in a patient are disclosed. |