The ketone XIII, obtained by Friedel-Crafts reaction of toluene with homoveratroyl chloride, was converted by the Leuckart reaction to the formamido derivative IXb which was used as the starting product for the synthesis of amines IIIb-Vb. Reduction of the ketone XIII gave the alcohol XVI which was treated with hydrogen chloride and afforded the chloro compound XVII. Its substitution reactions with 1-methylpiperazine, 1-(2-hydroxyethyl)piperazine and 1-phenylpiperazine resulted in the piperazines VIb-VIIIb. Acylations of the amine IIIb with acetic anhydride and homoveratroyl chloride gave the amides Xb and XIb which, together with the formamide IXb, were subjected to the Bischler-Napieralski reaction. 3,4-Dihydroisoquinolines XXII-XXIV were obtained and reduced to the 1,2,3,4-tetrahydroisoquinolines XXVb-XXVIIb. Treatment of XXVIIb with formaldehyde afforded the berbine derivative XXVIII. Demethylation of the amine IIIb with hydrobromic acid resulted in the title compound IIIa. Similar demethylations of the dimethoxyamines IVb-VIIIb, XXVb and XXVIb led to the dihydroxyamines IVa-VIIIa, XXVa and XXVIa which are dopamine derivatives. Reaction of Va with benzoyl chloride gave the dibenzoate XXX. The CNS activities of the compounds prepared are of a low degree. Several of them (IIIa-VIa, IIIb-Vb, XXVb) show in higher doses signs of central stimulant action but only for compound IVa an antireserpine effect was proven. The expected anticataleptic activity was found only in a low degree with compound VIIIa; on the contrary, compounds IIIa and XXVa are procataleptogenic. Some compounds (IIIa, IXb, XXVIa, XXVIII) potentiated thiopental. In single cases local anaesthetic, spasmolytic, hypotensive, hypertensive, hypoglycaemic, diuretic and antiarrhythmic effects were observed.
通过将甲苯与同戊酰氯进行弗里德尔-克拉夫茨反应得到的酮XIII,通过勒克阿尔特反应转化为甲酰胺衍生物IXb,后者用作合成胺IIIb-Vb的起始产品。酮XIII的还原得到醇XVI,经氯化氢处理得到氯化合物XVII。它与1-甲基哌嗪、1-(2-羟基乙基)哌嗪和1-苯基哌嗪的取代反应得到哌嗪VIb-VIIIb。胺IIIb与乙酸酐和同戊酰氯的酰化反应得到酰胺Xb和XIb,与甲酰胺IXb一起进行比施勒-纳皮尔兰斯基反应。得到3,4-二氢异喹啉XXII-XXIV,还原为1,2,3,4-四氢异喹啉XXVb-XXVIIb。用甲醛处理XXVIIb得到具夹竹桃碱衍生物XXVIII。用氢溴酸脱甲基胺IIIb得到标题化合物IIIa。类似地,对二甲氧基胺IVb-VIIIb、XXVb和XXVIb的脱甲基得到二羟基胺IVa-VIIIa、XXVa和XXVIa,它们是多巴胺衍生物。Va与苯甲酰氯反应得到二苯甲酸盐XXX。所制备的化合物的中枢神经系统活性程度较低。其中一些(IIIa-VIa、IIIb-Vb、XXVb)在高剂量下表现出中枢兴奋作用,但只有IVa被证实具有抗多巴胺效应。预期的抗惊厥活性只在VIIIa中以低程度发现;相反,化合物IIIa和XXVa具有致惊厥作用。一些化合物(IIIa、IXb、XXVIa、XXVIII)增强了硫喷妥钠的效果。在个别情况下观察到局麻、解痉、降压、升压、降糖、利尿和抗心律失常作用。