Method for the preparation of 2-methoxy-4-(N-t-butylamino-carbonyl)-benzenesulfonyl chloride
申请人:Sanofi-Synthelabo
公开号:US06548702B1
公开(公告)日:2003-04-15
The invention relates to a process for the preparation of 2-methoxy-4-(N-t-butylaminocarbonyl)benzenesulfonyl chloride by sulfonating m-hydroxybenzoic acid, methylating the hydroxy group of the resulting sulfonic acid or its salt, transforming the carboxylic acid group and the sulfonic acid group to acid chloride groups and reacting the 4-chlorosulfonyl-3-methoxy-benzoyl chloride with t-butylamine, which comprises carrying out the sulfonation of the 3-methoxy-benzoic acid of general formula (II) with 96% sulfuric acid, separating the resulting 3-hydroxy-4-sulfobenzoic acid of general formula (III) in the form of its salt of general formula (IV), wherein Z stands for alkali metal or ammonium group, methylating the compound of general formula (IV) in the presence of a phase transfer catalyst at a pH value of about 11.5, transforming the 3-methoxy-4-sulfobenzoic acid mono salt of general formula (V), wherein the meaning of Z is as defined above, to the acid chloride of general formula (VI), and reacting the compound of general formula (VI) with t-butylamine used in equimolar amount or in a small excess, in the presence of an acid binding agent, in aprotic solvent, at low temperature.
本发明涉及一种制备2-甲氧基-4-(N-t-丁基氨甲酰)苯磺酰氯的方法,包括通过对间羟基苯甲酸进行磺化、甲基化其产生的磺酸或其盐的羟基、将羧酸基团和磺酸基团转化为酸氯基团,然后将4-氯磺酰-3-甲氧基苯甲酰氯与t-丁基胺反应。其中,通过用96%的硫酸对通式(II)的3-甲氧基苯甲酸进行磺化,将得到通式(III)的3-羟基-4-磺基苯甲酸的盐,其中Z代表碱金属或铵基团;在存在相转移催化剂的情况下,在pH值约为11.5的条件下甲基化通式(IV)的化合物,将通式(V)的3-甲氧基-4-磺基苯甲酸单盐转化为通式(VI)的酸氯化物,然后在无极性溶剂中,在酸中和剂的存在下,在低温下,将通式(VI)的化合物与等摩尔量或略微过量的t-丁基胺反应。