Cyclization of the acids IV-VII with sulfuric or polyphosphoric acid resulted in the thioxanthones VIIIa-d which were treated with 3-dimethylaminopropylmagnesium chloride and gave the amino alcohols Xa-d. Their acid catalyzed dehydrations afforded the methoxy derivatives of chlorprothixene IIIa-d, mostly in form of mixtures of geometric isomers. Whereas the results of attempts to demethylate these products with boron tribromide gave mostly unsatisfactory results, the demethylation with pyridine hydrochloride at 190-200 °C was successful; alcohols X were the most suitable starting materials. In this manner, the hydroxy derivatives of chloroprothixene IIa-d were obtained, mostly as pure geometric isomers. The configuration was assigned on the basis of their IR spectra. Z-Isomers are potential metabolites of the neuroleptic agent chlorprothixene (I). Compounds II and III are little toxic, have low central depressant activity and are inactive cataleptically.
对于酸IV-VII的环化,使用硫酸或聚磷酸处理,得到了噻吩并苯酮VIIIa-d,随后使用3-二甲基氨基丙基氯化镁进行反应,得到了氨基醇Xa-d。这些产物在酸催化下脱水,形成了氯丙嗪的甲氧基衍生物IIIa-d,大部分以几何异构体的混合物形式存在。虽然使用三溴化硼进行去甲基化反应的结果不理想,但在190-200°C的条件下,使用盐酸吡啶进行去甲基化反应是成功的;醇类X是最适合的起始物质。通过这种方法,得到了氯丙嗪的羟基衍生物IIa-d,大部分以纯几何异构体的形式存在。它们的构型是基于它们的红外光谱确定的。Z-异构体是抗精神病药物氯丙嗪(I)的潜在代谢产物。化合物II和III毒性较小,中枢抑制活性低,且没有肢体僵直活性。