Alkylation of diethyl malonate with 2-(4-chlorophenylthio)benzyl chloride, the following hydrolysis and decarboxylation gave 3-[2-(4-chlorophenylthio)phenyl]propionic acid (IV); its chloride was cyclized in low yield by treatment with aluminium chloride to 4-(4-chlorophenylthio)indanone (V). The corresponding methylpiperazine derivative VIII was prepared viaintermediates VI and VII. A reaction of 3-(2-mercaptophenyl)propionic acid with 5-chloro-2-iodobenzoic acid and the following esterification resulted in the diester XVI which was cyclized by a Dieckmann reaction using sodium hydride in toluene to give ethyl 3-chloro-5-hydroxy-7H-dibenzo[b,g]thiocin-6-carboxylate (XVII). The acid hydrolysis afforded the ketone XVIII which was transformed via the intermediates XX and XXI to the title compound II. The product has a mild central depressant activity but it lacks the character of a neuroleptic agent.
乙酸二乙酯与2-(4-氯苯硫基)苄氯化物发生烷基化反应,随后水解和脱羧得到3-[2-(4-氯苯硫基)苯基]丙酸(IV);其氯化物经氯化铝处理低收率环化成4-(4-氯苯硫基)茚酮(V)。相应的甲基哌嗪衍生物VIII通过中间体VI和VII制备而成。3-(2-巯基苯基)丙酸与5-氯-2-碘苯甲酸反应,随后酯化得到二酯XVI,经Dieckmann反应在甲苯中用氢化钠环化得到乙酸乙酯3-氯-5-羟基-7H-二苯并[b,g]硫代吲哚-6-羧酸酯(XVII)。酸水解得酮XVIII,经中间体XX和XXI转化得到目标化合物II。该产物具有轻微的中枢抑制活性,但缺乏神经阻滞剂的特性。