A process for the preparation of derivatives tioxan tub.

摘要

Compounds of the formula (II): IMAGE (II) wherein: X is sulphur and Y is oxygen or sulphur; R1 is an alkyl group of up to 6 carbon atoms; R2 is an alkyl group of up to 6 carbon atoms; and n is 1; or X is oxygen and Y is sulphur; one of R1 and R2 is an alkyl group of up to 6 carbon atoms and the other is an alkyl group of 2 to 6 carbon atoms; and n is 1 or 2, having useful pharmacological activity, pro-drugs therefor, a process for their preparation, pharmaceutical compositions containing said compounds or pro-drugs, and intermediates in their preparation of the compounds.