A process for the production of known compounds of the formula IV ##SPC1## wherein R.sub.1 is hydrogen or alkyl of 1 to 3 carbon atoms, inclusive; wherein R.sub.2 is hydrogen, chloro, or fluoro; wherein R.sub.3 is hydrogen, or fluoro with the proviso that R.sub.3 is not fluoro if R.sub.2 is chloro; wherein R.sub.4 is hydrogen, chloro, fluoro, bromo, nitro, and trifluoromethyl, which comprises: treating a compound of the formula I: ##SPC2## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 have the same significance as above, in formic acid solution with aqueous formaldehyde; treating the resulting compound with phthalimide, triphenylphosphine and then diethyl azodicarboxylate to give a compound which when heated with hydrazine, gives compound IV above. The compounds of formula IV above are known useful antidepressant, tranquilizing, sedative and anti-convulsant agents. The intermediates have also activity in the sedative-tranquilizing area and these compounds can be used in mammals and birds for tranquilization.
本发明涉及一种制备公式IV已知化合物的方法:其中R1为氢或1至3个碳原子的烷基;R2为氢、
氯或
氟;R3为氢或
氟,但若R2为
氯,则R3不能为
氟;R4为氢、
氯、
氟、
溴、硝基或三
氟甲基。该方法包括以下步骤:将公式I的化合物(其中R1、R2、R3和R4的含义与上述相同)在
甲酸溶液中与
水甲醛处理;用邻苯二甲
酰亚胺、
三苯基膦和乙基偶氮二
甲酸酯处理所得化合物,然后加热与
肼反应,得到上述的化合物IV。公式IV的化合物是已知的有用的抗抑郁、镇静、催眠和抗惊厥剂。中间体在镇静-催眠领域也具有活性,这些化合物可用于哺乳动物和鸟类的镇静作用。