Reactions of 2,4,5-trichlorothiophenol (II) with 2-iodobenzoic acid and 2,3-dichlorothiopheno with 3,5-dichloro-2-iodobenzoic acid gave the acids III and IX which were cyclized to thioxanthones VI and XV. Reactions of these ketones with 3-dimethylaminopropylmagnesium chloride afforded the amino alcohols VII and XVI which were transformed by the acid catalyzed dehydration to the title compounds I and VIII. 2-Chloro-9-[1-(2-hydroxyethyl)-4-piperidylidene]thioxanthene (XVII) was obtained by a modified synthesis. Compound I is inactive in the line of the CNS effects but it has high inhibitory activity in the in vitro tests towards gram-positive microorganisms. Compound XVII has properties of a mild tranquillizer.
2,4,5-三氯硫代苯酚(II)与2-碘苯甲酸和2,3-二氯硫代苯酚与3,5-二氯-2-碘苯甲酸反应,得到酸III和IX,它们被环化为硫代黄酮VI和XV。这些酮与3-二甲氨基丙基氯化镁反应,得到氨基醇VII和XVI,经酸催化脱水转化为标题化合物I和VIII。通过改良合成方法得到2-氯-9-[1-(2-羟乙基)-4-哌啶基]硫代黄酮(XVII)。化合物I在中枢神经系统效应方面无活性,但在体外试验中对革兰氏阳性微生物具有高抑制活性。化合物XVII 具有轻度镇静剂特性。