A process for the preparation of 4-hydroxyalkylamino-2-nitro-anisoles of the general formula (I)
wherein m is 2 or 3;
by reaction of a 4-halogeno-3-nitro-aniline of formula (II) with a chloroalkyl-chloroformate of formula (III), alkaline ring closure of the resulting carbamate and nucleophilic replacement of the halogeno atom by a methoxy group to form a derivative of formula (IV), and finally ring opening of the resulting cyclic carbamate by treatment with methanolic alkali metal hydroxide, followed by neutralization with inorganic or organic acids, wherein the complete reaction is executed in a non-aqueous medium; as well as process for the preparation of 2-amino-4-hydroxyalkylamino-anisoles of formula (V)
一种制备通式(I)中
4-羟基烷基
氨基-
2-硝基苯甲醚的方法,其中m为2或3;通过将通式(II)中的4-卤代-3-
硝基苯胺与通式(III)中的
氯代烷基
氯甲酸酯反应,碱性环合成所得的
氨基甲酸酯,亲核置换卤代原子为甲氧基以形成通式(IV)的衍
生物,最后通过用
甲醇钠水解环状
氨基甲酸酯,中和无机或有机酸的方法开环,完成反应在非
水介质中进行;以及制备通式(V)中2-
氨基-
4-羟基烷基
氨基
苯甲醚的方法。