Compounds of the formula I
in which R
1
, R
2
and R
4
have the meanings indicated in Claim
1,
are inhibitors of Syk, and can be employed, inter alia, for the treatment of cancer, rheumatoid arthritis and/or systemic lupus
Compounds of the formula I
in which R
1
and R
2
have the meanings indicated in claim
1
, are inhibitors of Syk, and can be employed, inter alia, for the treatment of rheumatoid arthritis.