IMIDAZOPYRIDAZINE COMPOUNDS

摘要

The present invention is directed to compounds of Formula I: (see formula I) or a pharmaceutically acceptable salt thereof, wherein the substituents R1, R3, R6, R7, and b are as defined herein. The invention is also directed to pharmaceutical compositions comprising the compounds, uses of the compounds as PDE4A, PDE4B and/or PDE4C inhibitors, and methods of preparing the compounds.