[Problems] To provide a novel process for producing ramosetron or its salt that is useful as a pharmaceutical, especially as a therapeutic and/or preventive agent for digestive symptoms caused by administration of an anti-malignant tumor agent, diarrheal-type irritable bowel syndrome, diarrheal symptoms of irritable bowel syndrome, etc.
[Means for Resolution] Ramosetron or its salt can be produced by reacting a compound of the formula (I):
[wherein X is a halogen] or a salt thereof with 1-methyl-1H-indole in the presence of a Lewis acid selected from the group consisting of a lower alkylaluminum dihalide, a di-lower alkylaluminum halide, a tri-lower alkylaluminum and a lower alkylaluminum sesquihalide.
[问题] 提供一种新的生产拉莫色隆或其盐的方法,该方法可作为制药用途,特别是作为治疗和/或预防由抗恶性肿瘤药物引起的消化症状,腹泻型肠易激综合症,肠易激综合症腹泻症状等的治疗和/或预防剂。
[解决方法] 在低级烷基铝二卤化物,低级烷基铝卤化物,三低级烷基铝和低级烷基铝半卤化物的Lewis酸存在下,将公式(I)化合物[其中X为卤素]或其盐与1-甲基-1H-
吲哚反应,即可制备拉莫色隆或其盐。