Compounds of the formula (I), in which R
1
, R
2
and R
3
have the meanings indicated in claim
1
, are inhibitors of tyrosine kinases, in particular Met kinase, and can be employed, inter alia, for the treatment of tumours
式(I)中的化合物,其中R1、R2和R3具有权利要求1中指示的含义,是
酪氨酸激酶的
抑制剂,特别是Met激酶,并可用于治疗肿瘤。