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-
硝基苯酚的方法,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,碱性环合生成的
氨甲酸酯,然后通过亲核取代将卤代原子替换为甲氧基,形成通式(IV)的衍
生物,最后通过用
甲醇烷基
金属羟化物处理生成的环状
氨甲酸酯进行环开启,随后用无机或有机酸中和,完整的反应在非
水介质中进行;以及制备通式(V)中2-
氨基-
4-羟基烷基
氨基苯酚的方法。