Reactions of (4-fluoro-2-iodophenyl)acetic or (2-bromo-4-fluorophenyl)acetic acid with 4-methylthiophenol, 4-ethylthiophenol and 4-isopropylthiophenol under various conditions afforded the acids IIIa-c which were cyclized with polyphosphoric acid to 8-alkyl-3-fluorodibenzo-[b,f]thiepin-10(11H)-ones IVa-c. The alcohols Va-c, which were obtained by reduction of the ketones with sodium borohydride, were transformed by treatment with hydrogen chloride to the chloro derivatives Via-c. Their substitution reactions with 1-methylpiperazine and 1-(2-hydroxyethyl)piperazine afforded the title compounds Ib, Ic and IIa. The corresponding 2-alkyl-7-fluorodibenzo[b,f]thiepins VIIa-c were obtained as by-products. Reaction of the ketone IVc with 1-methylpiperazine in the presence of titanium tetrachloride gave the enamine VIII. The piperazine derivatives prepared are very potent neuroleptic agents with regard to their acute activities. Important prolongation of the effects was found mainly with the isopropyl compounds Ic and VIII.
(4-氟-2-碘苯基)乙酸或(2-溴-4-氟苯基)乙酸与4-甲基硫代苯酚、4-乙基硫代苯酚和4-异丙基硫代苯酚在不同条件下反应,生成酸IIIa-c,再通过多聚磷酸环化得到8-烷基-3-氟二苯并[]噻吩-10(11H)-酮IVa-c。用硼氢化钠还原酮得到醇Va-c,再经氯化氢处理得到氯代衍生物Via-c。它们与1-甲基哌嗪和1-(2-羟乙基)哌嗪的取代反应生成目标化合物Ib、Ic和IIa。相应的2-烷基-7-氟二苯并[]噻吩VIIa-c作为副产物获得。将酮IVc与1-甲基哌嗪在四氯化钛存在下反应得到烯胺VIII。制备的哌嗪衍生物在其急性活性方面具有很强的神经酰胺类药物作用。发现其效果的重要延长主要是由异丙基化合物Ic和VIII引起的。