The invention provides a compound of the general formula (I) wherein R1 is selected from hydrogen, cycloalkyl and cycloalkenyl having 3 to 7 ring members; phenyl-C1-4 alkyl or a group R4-A-CH2-, R2 is selected from aryl and heteroaryl having five to twelve ring members; cycloalkyl and cycloalkenyl having 3 to 7 ring members; a group (CR6R7)pE-R8, or R1 and R2 together with the nitrogen atom to which they are attached form a heterocyclic group having 5 to 10 ring members; R3 is a substituent selected from halogen, CN, N-linked monocyclic nitrogen-containing heterocyclic groups having from 3 to 7 ring members and containing up to three heteroatoms; and a group Ra-Rb. The substituents R4-R, Ra and Rb are defined in claim 1. The compounds have activity as inhibitors of cyclin dependent kinases and are useful in the treatment of disease states and conditions, such as proliferative diseases, mediated by cyclin dependent kinases.
[EN] 2-AMINOPYRAZINE DERIVATIVES AS INHIBITORS OF CYCLIN DEPENDENT KINASES FOR THE TREATMENT OF PROLIFERATIVE DISORDERS<br/>[FR] COMPOSES PHARMACEUTIQUES