Products of formula (I): in which: R1 represents a radical -L-aryl or -L-heteroaryl, such that L represents: either a simple bond, or a linear or branched alkyl radical comprising from 1 to 6 atoms of carbon and optionally substituted with a hydroxyl radical, or a CO or -CO-Alk- group； either an L'-X group where L 'represents a linear or branched alkyl radical containing from 1 to 6 carbon atoms and X an oxygen or sulfur atom； the aryl and heteroaryl radicals being optionally substituted with one or several identical or different radicals chosen from the halogen atoms and the hydroxyl, CN, nitro, -COOH, -COOalk, -NRxRy, -CONRxRy, -NRxCORy, -NRxCO2Rz, - CORy, alkoxy, phenoxy, alkylthio, alkyl, cycloalkyl and heterocycloalkyl； the latter being alkoxy, phenoxy, alkylthio, alkyl and heterocycloalkyl radicals themselves optionally substituted with one or several identical or different radicals chosen from halogen atoms and NRvRw； the heterocycloalkyl and heteroaryl radicals may also contain an oxo radical； R2 represents a hydrogen atom or an alkyl radical； R3 represents an alkyl radical optionally substituted with one or more halogen atoms； R4 represents a hydrogen atom or a halogen atom； NRxRy being such that Rx represents a hydrogen atom or an alkyl radical and Ry represents a hydrogen atom, a cycloalkyl radical or an alkyl radical optionally substituted with one or more identical or different radicals chosen from the hydroxyl, alkoxy, NRvRw and heterocycloalkyl radicals ； or Rx and Ry form with the nitrogen atom to which they are attached a cyclic radical comprising from 3 to 10 links and optionally one or several different heteroatoms chosen from O, S, NH and N-alkyl, this radical being Cyclic optionally substituted.Productos de fórmula (I): en la que: R1 representa un radical -L-arilo o -L-heteroarilo, tal que L representa : o bien simple enlace, bien un radical alquilo lineal o ramificado que comprende de 1 a 6 átomos de carbono y opcionalmente sustituido con un ra
