Compounds of formula I or a stereoisomer or pharmaceutically-acceptable salt thereof, are useful in the modulation of IL-12, IL-23 and/or IFNa, by acting on Tyk-2 to cause signal transduction inhibition. The compounds of formula I are useful for the treatment of inflammatory or autoimmune diseases.
式I的化合物或其立体异构体或药用盐在调节IL-12、I
L-23和/或IFNa方面具有用处,通过作用于Tyk-2引起信号传导抑制。式I的化合物适用于治疗炎症性或自身免疫疾病。