Compounds of the formula
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, carboxy, 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-GO2R2 (wherein R2 is as defined above) at the 17aβ-position, and salts thereof have activity as antidysrhythmic agents and may be applicable for the treatment of dysrhythmias 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.
式中的化合物
式中
R1 是 C1-8 烷基或 C3-7 环烷基;
R2 是 C1-6 烷基或 C3-7 环烷基;
R3 是羟基或式 -OR4 或 -OCOR5 的基团,其中
R4 是最多可含 6 个碳原子的烷基或烯基(或被卤素、C1-6 烷氧基、羧基、苯基、被硝基、卤素、C1-4 烷氧基或 C1-4 烷基取代的苯基)、C3-7 环烷基、苯基(或被硝基、卤素、C1-4 烷氧基或 C1-4 烷基取代的苯基)或与碳相连的 5-7 个杂环,其中杂原子选自氮、氧和
硫,以及
R5 是氢原子或如上定义的基团 R4;以及在 17aβ 位上具有基团-GO2R2(其中 R2 如上定义)的 D-高分子类似物及其盐具有抗心律失常剂的活性,可用于治疗人类或动物的心律失常。这些化合物可以以与药物载体或赋形剂混合的组合物形式提供,并可通过生产此类类
固醇的各种已知工艺制备。本发明还提供了制备式(I)化合物的中间体,其中中间体 R1 和/或 R2 被氢原子取代,以及制备此类中间体的工艺。