| abstract |
The invention relates to compounds of formula (I) and their preparation and their application in therapeutics: (see formula I) in which : R1 and R2 represent independently of one another: . a hydrogen atom, or . a C1-C7 alkyl group optionally substituted with one or more groups alkoxy, R3 represents a C1-C7 alkyl group; R4 represents a hydrogen atom, or a C1-C4 alkyl group; Y represents a C1-C4 alkoxy group, a group -NRR ', or -O (CH2) -C (O) -NRR' where R and R 'are as defined below and n is an integer of 1 or 2; R and R 'represent, independently of one another, a hydrogen atom, a group -CO-C 1 -C 4 alkyl or -COOR "group, where R" represents an alkyl group C1-C4. |