Derivatives of cyano-2-hydroxy-3-benzofurane and benzo(b)thiophene, their preparation and their use in therapy.

摘要

Compounds of formula <IMAGE> in which X denotes an oxygen or sulphur atom, each of R1 and R2 denotes a hydrogen atom or a lower alkyl group, or else R1 and R2 form, with the nitrogen atom to which they are attached, a pyrrolidino, piperidino or morpholino group, and their salts of addition to pharmaceutically acceptable acids. beta -blocking medications.