This invention relates to novel indolothiopyrones having the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl or aryl; R.sub.2 is hydrogen or halogen; and R.sub.7 is hydrogen, lower alkyl, lower alkenyl, lower alkynyl, nitro-substituted-aryl, or .omega.-substituted lower alkyl wherein the substituent is: ##STR2## wherein R.sub.4 and R.sub.5 each represent hydrogen, lower alkyl, or together with the nitrogen atom, form a heterocyclic ring; and R.sub.6 is lower alkoxy or amino, and novel intermediates used in their preparation. The indolothiopyrones are prepared by reacting a 3-mercaptoindole with sodium propiolate or a substituted sodium propiolate followed by acidification to obtain an intermediate acid; the intermediate acid cyclizes in the presence of an acid catalyst to obtain the indolothiopyrone structure which may be additionally subjected to halogenation, alkylation or hydrolysis to obtain derivatives having the various substituent groups disclosed. The compounds of this invention are useful in the treatment of angina pectoris and conditions benefiting from the depression of the central nervous system.
本发明涉及一种新型的
吲哚硫吡酮,其
化学式为:##STR1## 其中R.sub.1为氢,低烷基或芳基;R.sub.2为氢或卤素;R.sub.7为氢、低烷基、低烯基、低炔基、硝基取代的芳基或ω-取代的低烷基,其中取代基为:##STR2## 其中R.sub.4和R.sub.5分别表示氢、低烷基或与氮原子一起形成杂环环;R.sub.6为低烷氧基或
氨基,以及用于它们制备的新型中间体。这些
吲哚硫吡酮是通过将
3-巯基吲哚与
丙炔酸钠或取代的
丙炔酸钠反应,然后酸化以得到中
间酸;在酸催化剂存在下,中
间酸环化以得到
吲哚硫吡酮结构,该结构可以进一步接受卤素化、烷基化或
水解以获得具有所披露的各种取代基的衍
生物。本发明的化合物在治疗心绞痛和受益于中枢神经系统抑制的情况下有用。