A process of preparing a compound of formula (I):
wherein R1 and R2 are alkyl groups of 1 to 4 carbon atoms and n is from 2 to 5, comprises reacting a 1-chloro-7-(protected hydroxy)-4-nitroacridin-9(10H)-one of formula (IV-P):
wherein A is a hydroxy-protecting group removable by reduction, with an &ohgr;-(dialkylamino)alkylamine of formula
NH2—(CH2)nNR1R2
in which n, R1 and R2 are as defined above, to produce a 7-(protected hydroxy)4-nitro-1-[[&ohgr;-(dialkylamino)alkyl]amino]acridin-9(10H)-one (III-P), reducing the compound III-P at a temperature of from 15 to 50° C. with a hydrogen gas or with formate ions, in the presence of a palladium catalyst and formic acid, removing substantially all the residual palladium and heating the remaining reaction mixture to effect cyclization to the corresponding compound of formula (I). If desired, after removal of the palladium the intermediate 7-hydroxy-4-N-formyl-1-[[&ohgr;-(dialkylamino)alkyl]amino]acridin]-9(10H)-one can be isolated and subsequently cyclized by heating. Such compounds have anti-neoplastic activity.
一种制备化合物的过程,其
化学式为(I):其中R1和R2是1至4个碳原子的烷基基团,n为2至5,包括将具有
化学式(IV-P)的1-
氯-7-(保护羟基)-4-硝基
蒽醌-9(10H)-酮与具有
化学式NH2—(
CH2)nNR1R2的ω-(二烷基
氨基)烷胺反应,其中n、R1和R2如上定义,A是可通过还原去除的羟基保护基团,以产生7-(保护羟基)4-硝基-1-【ω-(二烷基
氨基)烷基】
氨基
蒽醌-9(10H)-酮(III-P),将化合物III-P在15至50°C的温度下与
氢气或
甲酸根离子在
钯催化剂和
甲酸存在下还原,去除几乎所有残留的
钯,并加热剩余的反应混合物以实现环化反应形成相应的化合物(I)。如果需要,在去除
钯后,中间体7-羟基-4-N-甲酰基-1-【ω-(二烷基
氨基)烷基】
氨基
蒽醌-9(10H)-酮可以被分离并随后通过加热进行环化。这类化合物具有抗肿瘤活性。