The 6-nitro derivative V, obtained by nitration of 3,4-dichlorobrombenzene, was transformed via the amine VI and nitrileVII to 2-bromo-4,5-dichlorobenzoic acid (IX). Its reaction with thiophenol in 3-methyl-1-butanol in the presence of potassium carbonate and catalytic amounts of copper and cuprous iodide afforded 4,5-dichloro-2-(phenylthio)benzoic acid (Xa) which was reduced to the alcohol XIa. The transformation to the homologous acid XIVa proceeded via noncharacterized intermediates XIIa and XIIIa. The cyclization with polyphosphoric acid at 150 °C resulted in 2,3-dichlorodibenzo[b,f]thiepin-10(11H)-one (XV) which was reduced to the alcohol XVI. Treatment with hydrogen chloride gave the unstable chloro derivative XVII whose substitution reaction with 1-(2-hydroxyethyl)piperazine led to the title compound II. Its dimethanesulfonate showed properties of a little toxic and noncataleptic tranquillizer. Because it does not influence the dopamine metabolism in rat brain in a rather high dose, it cannot be considered a neuroleptic.
通过对3,4-二氯溴苯进行硝化反应得到的6-硝基衍生物V,经胺VI和腈VII转化为2-溴-4,5-二氯苯甲酸(IX)。在3-甲基-1-丁醇中,在碳酸钾和铜及碘化亚铜的催化下,与硫代苯酚发生反应,得到4,5-二氯-2-(苯硫基)苯甲酸(Xa),进而还原为醇XIa。经过未表征的中间体XIIa和XIIIa,转化为同系物酸XIVa。在150°C下,经过多磷酸环化,得到2,3-二氯二苯并[bf]噻吩-10(11H)-酮(XV),再还原为醇XVI。经氢氯酸处理得到不稳定的氯衍生物XVII,其与1-(2-羟乙基)哌嗪发生取代反应,形成标题化合物II。其二甲磺酸盐呈现出略有毒性和非痉挛镇静药的特性。由于在大剂量下不影响大鼠脑中多巴胺代谢,因此不能被视为一种神经阻滞剂。