| abstract |
A compound of the formula: in which: Ra represents C1-6 alkyl; R1 represents a naphthyl group or a phenyl, furyl, thienyl or pyridyl group that is unsubstituted or substituted with one or two substituents independently selected from halogen; nitro; cyano; hydroxyimino; C1-10 alkyl; C2-10 alkenyl; C2-10 alkynyl; C3-8 cycloalkyl; C3-8 hydroxycycloalkyl; C3-8 oxocycloalkyl; C1-10 haloalkyl; (CH2) and X1R9 in which y is 0 or 1, X1 represents O, CO, CONH or NHCO, and R9 represents hydrogen, C1-4 alkyl, C2-4 alkenyl, C3-6 cycloalkyl, pyrrolidinyl, morpholino or tetrahydrofuryl; N-C 1-4 alkyl piperazinyl; N-phenylalkyl (C1-4) piperazinyl; thienyl; furilo oxazolyl; isoxazolyl; pyrazolyl; imidazolyl; thiazolyl; pyridyl; pyridazinyl; pyrimidinyl; dihydrothienyl; dihydrofuryl; dihydrothiopyranyl; dihydropyranyl; dihydrotiazolyl; (C1-4) alkoxycarbonyldihydrotiazolyl; (C1-4) alkoxycarbonyldimethyldihydrotiazolyl; tetrahydrothienyl; tetrahydrofuryl; tetrahydrothiopyranyl; tetrahydropyranyl; indolyl; benzofuryl; benzothienyl; benzothiazolyl; benzimidazolyl. |