BENZOPYRAN COMPOUNDS,A PROCESS FOR THEIR PREPARATION,AND PHARMACEUTICAL COMPOSITIONS COMPRISING THEM

摘要

Process for the preparation of compounds of formula I: …… in which: … …  R1 represents a hydrogen atom or an alkyl radical comprising 1 to 3 carbon atoms, …  R represents a hydrogen atom, an alkyl radical comprising 1 to 4 carbon atoms, or an acyl radical - CO - R' in which R' represents an alkyl radical composed of 1 to 4 carbon atoms, …  X represents O or H2, … of their isomers,… as well as of their addition salts with a pharmaceutically acceptable acid or base.