The invention relates to compounds of formula (I)
wherein X, R
1
, R
2
, R
3
, R
8
, R
9
have the meaning as cited in the description and the claims. Said compounds are useful as inhibitors of ZAP-70 for the treatment or prophylaxis of immunological, inflammatory, autoimmune, allergic disorders, and immunologically-mediated diseases. The invention also relates to pharmaceutical compositions including said compounds, the preparation of such compounds as well as the use as medicaments.