Compounds having the following formula (I): or a stereoisomer or pharmaceutically-acceptable salt thereof, where R
1
, R
2
, R
3
, R
4
, and R
5
are as defined herein, are useful in the modulation of IL-12, IL-23 and/or IFNα, by acting on Tyk-2 to cause signal transduction inhibition.
具有以下式(I)的化合物或其立体异构体或药学上可接受的盐,其中R1、R2、R3、R4和R5的定义如本文所述,可用于调节IL-12、I
L-23和/或IFNα,通过作用于Tyk-2以引起
信号转导抑制。