| 摘要 |
Compounds of the formula <IMAGE> (I) wherein R1 is a C1-8 alkyl group or a C3-7 cycloalkyl group; R2 is a C1-6 alkyl group or a C3-7 cycloalkyl group; R3 is a hydroxy group or a group of formula -OR4 or -OCOR5 where R4 is an alkyl or alkenyl group which may contain up to 6 carbon atoms (or such a group substituted by halogen, C1-6 alkoxy, carboxyl, phenyl, phenyl substituted by nitro, halo, C1-4 alkoxy or C1-4 alkyl), a C3-7 cycloalkyl group, a phenyl group (or such a group substituted by nitro, halo, C1-4 alkoxy or C1-4 alkyl), or a carbon-attached 5-7 membered heterocyclic ring in which the hetero atom is selected from nitrogen, oxygen and sulphur, and R5 is a hydrogen atom or a group R4 as defined above; and the D-homo analogues thereof having the group -CO2R2 (wherein R2 is as defined above) at the 17a beta -position, and salts thereof have activity as antidysrhythmic agents and may be applicable for the treatment of dysrhthmias in humans or animals. The compounds may be provided in the form of compositions in admixture with pharmaceutical carriers or excipients and may be prepared by a variety of processes known for producing steroids of this type. The invention also provides intermediates for the preparation of compounds of formula (I), in which intermediates R1 and/or R2 is replaced by a hydrogen atom, and processes for the preparation of such intermediates. |
