4-hydroxyphenylthio derivatives, their preparation and their use for the preparation of aminoalkoxyphenylsulphonyl derivatives

摘要

The subject of the invention is 4-hydroxyphenylthio derivatives of general formula: <IMAGE> I in which: R1 and R2, which are identical or different, each represent hydrogen, a methyl or ethyl radical or a halogen atom, R represents a (C1-C6) alkyl, (C3-C6) cycloalkyl or phenyl radical, R3 represents hydrogen or a halogen atom, X represents -O-, -S- or -NR4- in which R4 represents hydrogen or a (C1-C4) alkyl group, useful as synthetic intermediates, especially for the preparation of aminoalkoxyphenylsulphonyl derivatives which are pharmaceutically active compounds.