Substituted phenoxyisobutryric acids and esters

摘要

The substituted phenoxyisobutyric acids and their esters of formula I: in which: - X represents an oxygen atom, a sulphur atom or a single bond; - A represents a single bond or a hydrocarbon radical containing from 1 to 9 carbon atoms in a straight or branched chain optionally containing a double bond, a cyclopropyl radical, an oxygen atom or a carbonyl radical, or optionally substituted by a halogen atom or a hydroxyl radical; - R represents a hydrogen atom or an alkyl radical containing from 1 to 6 carbon atoms in a straight or branched chain optionally substituted by one or two hydroxyl radicals; - R1 and R3: . each simultaneously represent a hydrogen atom, or . together form a bridge (CH2)n in which n takes the values 1 or 2, or . R1 represents: . a methyl radical, or . a single bond which forms a double bond with the group A when the latter is a hydrocarbon radical, and . in each of these cases, R3 simultaneously represents a hydrogen atom; - R2 and R6, which are identical or different, each represent a hydrogen atom or a methyl radical; - R4 and R5, which are identical or different, each represent an alkyl radical containing from 1 to 6 carbon atoms in a straight or branched chain; - R7 represents a hydrogen atom or a labile protective group such as, for example, a CH3CO-, C2H5O-CH2- or benzyl radical; and - Z represents a hydrogen or halogen atom or an alkyl or alkoxy radical each containing from 1 to 5 carbon atoms in a straight or branched chain; and, when they exist, the corresponding enantiomers and diastereoisomers, as well as the physiologically tolerable salts of the compounds I with appropriate bases, can be used in therapeutics.d