The acid VI, prepared by reaction of potassium salts of (2-iodo-5-methoxyphenyl)acetic acid and 4-(methylthio)thiophenol in the presence of copper, was transformed via intermediates VII-IX to 2-methoxy-8-methylthio-10-piperazino-10,11-dihydrodibenzo[b,f]thiepins X and XI. Their demethylation with boron tribromide afforded 2-hydroxy derivatives of the neuroleptic agents methiothepin and oxyprothepin I and II. 11-Chloro-7-methoxy-2-methylthio-10,11-dihydrodibenzo[b,f]thiepin was subjected to substitution reactions with 1-methylpiperazine and 1-(ethoxycarbonyl)piperazine and gave piperazine derivatives XIII and XIV, out of which the latter gave the secondary amine XV by alkaline hydrolysis. The ethers XIII and XV were also cleaved with boron tribromide and gave 3-hydroxy derivatives of methiothepin (III) and its demethyl derivative IV. The phenols I, II, and IV are potential metabolites of the mentioned neuroleptic agents; compound III, which already was identified as a metabolite, disclosed properties of a strong and cataleptic neuroleptic agent with prolonged duration of the effects. The methoxy compounds X, XI, and XIII are practically devoid of the neuroleptic activity.
通过在铜的存在下,将(2-碘-5-甲氧基苯基)乙酸和4-(甲硫基)噻吩的钾盐反应制备的酸VI,通过中间体VII-IX转化为2-甲氧基-8-甲硫基-10-哌嗪基-10,11-二氢二苯并[b,f]噻吩X和XI。它们经过硼三溴化物去甲基化后形成神经阻滞剂甲硫噻噻嗪和氧普噻噻嗪的2-羟基衍生物I和II。11-氯-7-甲氧基-2-甲硫基-10,11-二氢二苯并[b,f]噻噻嗪经过与1-甲基哌嗪和1-(乙氧羰基)哌嗪的取代反应,形成哌嗪衍生物XIII和XIV,其中后者通过碱性水解形成二级胺XV。醚化合物XIII和XV也可以用硼三溴化物裂解,形成甲硫噻噻嗪(III)及其去甲基衍生物IV的3-羟基衍生物。酚类化合物I、II和IV是所述神经阻滞剂的潜在代谢产物;已被鉴定为代谢产物的化合物III具有强烈的和短暂的神经阻滞剂效应。甲氧基化合物X、XI和XIII几乎没有神经阻滞活性。