This invention relates to a process for preparing derivatives of 5,11-dihydro-6H-pyrido[2,3-b][1,4]-benzodiazepin-6-one of general formula (I) ##STR1## in which R is hydrogen, halogen or methyl; R.sub.1 and R.sub.2 are linear or branched C.sub.2 -C.sub.4 alkyl groups, which alternatively may be joined together to give a piperazine cycle which can be substituted in position 4 with a methyl, ethyl or benzyl group, and their salts with organic and inorganic acids, characterised by comprising the following stages: (a) reacting a compound of general formula (X), ##STR2## in which R has the meaning heretofore defined, with 2-cloro-3-amino-pyridine of formula (III) ##STR3## in the presence of polyphosphoric acid, to give an intermediate of general formula (II) ##STR4## (b) reacting said intermediate with a compound of general formula (XI) ##STR5## in which R.sub.1 and R.sub.2 have the meaning heretofore defined and R.sub.3 is a hydroxyl or halogen, in an inert solvent at a maximum temperature equal to the solvent boiling point, to give said derivatives of general formula (I). The invention also relates to the final compounds thus obtained, and the synthesis intermediates obtained during the course of said process. The final products of formula (I) are of great interest in the pharmaceutical field.
本发明涉及一种制备5,11-二氢-6H-
吡啶[2,3-b][1,4]-苯并二氮平-6-酮(通式(I))的衍
生物的过程,其中R为氢、卤素或甲基;R1和R2为线性或支链的C2-C4烷基,也可以连接成
哌嗪环,该
哌嗪环可以在4位上用甲基、乙基或苄基进行取代,以及它们与有机和
无机酸的盐,其特征在于包括以下步骤:(a)将通式(X)的化合物与3-
氨基-2-
氯吡啶(式(III))在多聚
磷酸的存在下反应,其中R具有上述定义的含义,得到通式(II)的中间体;(b)在惰性溶剂中,将上述中间体与通式(XI)的化合物反应,其中R1和R2具有上述定义的含义,R3为羟基或卤素,最高温度等于溶剂沸点,得到通式(I)的衍
生物。本发明还涉及由该过程得到的合成中间体以及最终得到的化合物。公式(I)的最终产品在制药领域具有极大的兴趣。