[EN] 3 -CYANO- 5 -ARYLAMINO-7 -CYCLOALKYLAMINOPYRROLO [1, 5 -A] PYRIMIDINE DERIVATIVES AND THEIR USE AS ANTITUMOR AGENTS [FR] DÉRIVÉS DE PYRIMIDINE 3-CYANO-5-ARYLAMINO -7-CYCLOALKYLAMINOPYRROLO [1, 5-A] ET LEURS UTILISATIONS COMME AGENTS ANTITUMORAUX