10,11-Dihydrodibenzo[b,f]thiepin-10-carbonitrile (XVI) was reduced with aluminium hydride to the primary amine XVII which was formylated with acetic formic anhydride. The formamide derivative was cyclized by the Bischler-Napieralski reaction to the condensed dihydroisoquinoline XX. Addition of methyl vinyl ketone to the hydrochloride of compound XX at 100 °C gave a mixture of the stereoisomeric 3b,4,5,6,7,9,9a,10-octahydro[1]benzothiepino[2,3,4-ed]pyrido[2,1-a]isoquinolin-5-ones (XIII) which was separated by chromatography to the major 3b,9a-cis isomer XIIIb and the minor 3b,9a-trans isomer XIIIa to which the configuration was assigned on the basis of analogy. Reactions of both ketones with tert-butylmagnesium chloride and isopropyllithium led to mixtures whose chromatographic separation afforded the tertiary alcohols XIa, XIb, XIIa and XIIb mostly in low yields. In most cases the main products were the secondary alcohols XIV and apparently also the pinacols XXIII, formed by reduction. An attempt at preparing similar [1]benzothiopyrano[2,3,4-ed]pyrido[1,2-a]isoquinoline derivatives was discontinued because of an anomalous result of cyclization of compound XXVII. Compound XIa, being a 15-thia analogue of isobutaclamol (VI) displayed a high affinity to dopamine receptors in striatum of the rat brain which confirms the correctness of the assignment of relative configuration on C(3b) and C(9a).
10,11-二氢二苯并[b,f]噻吩-10-碳腈(XVI)被铝氢化物还原为初级胺XVII,然后用乙酸甲酸酐进行甲酰化。甲酰胺衍生物通过Bischler-Napieralski反应环化成为紧缩的二氢异喹啉XX。在100℃下,将甲基乙烯酮加入化合物XX的盐酸中,得到立体异构体3b,4,5,6,7,9,9a,10-八氢[1]苯并噻吩[2,3,4-ed]吡啶[2,1-a]异喹啉-5-酮(XIII)的混合物,通过色谱分离得到主要的3b,9a-cis异构体XIIIb和次要的3b,9a-trans异构体XIIIa,其构型基于类比确定。两个酮与叔丁基氯化镁和异丙基锂反应,得到混合物,色谱分离后主要得到低收率的三级醇XIa、XIb、XIIa和XIIb。在大多数情况下,主要产物为二级醇XIV,显然还有通过还原形成的缩醛XXIII。尝试制备类似的[1]苯并噻吩并吡啶[1,2-a]异喹啉衍生物的反应因XXVII化合物环化异常而中止。化合物XIa是异丁氯胺醇(VI)的15-硫代衍生物,在大鼠脑纹状体多巴胺受体中显示出高亲和力,证实了对C(3b)和C(9a)相对构型的正确分配。