Pharmaceutical process and compounds prepared thereby

摘要

The present invention relates to an improved process for the preparation of a sulfinyl compound of formula (I), or a pharmaceutically acceptable salt, hydrate or solvate thereof, from a sulfide compound of formula (II), wherein in both formulae (I) and (II) R₁ and R₃ are selected from the group consisting of hydrogen, methyl or C_1-4alkoxy, R₂ is selected from the group consisting of substituted or unsubstituted C_1-4alkoxy and R₄ is selected from the group consisting of hydrogen or substituted or unsubstituted C_1-4alkoxy.