申请人:——
公开号:US20030216593A1
公开(公告)日:2003-11-20
The present invention provides a fast, high yield method for preparing salicylamide intermediates. The method comprises reacting a C
4
or higher alkyl ester of salicylic acid or derivative thereof with at least one amine selected from the group consisting of monoalkylamines, dialkylamines, ammonia, and any combination of any of the foregoing in alcohol to yield the sali-cylamide. The C
4
or higher alkyl ester of salicylic acid or a derivative thereof is preferably prepared by reacting salicylic acid or a derivative thereof with a C
4
or higher alcohol in presence of at least one of sulfuric acid, a sulfonic acid, and a mineral acid. This process for preparing salicylamide intermediates from salicylic acid or derivative thereof generally has a cycle time of about 2 days, and yields about 95% of a 99% pure material. In comparison, when a C
3
or lower alkyl ester is used in lieu of the C
4
or higher alkyl ester, the process generally has a cycle time of 7-9 days and yields about 60% of a 95% pure material. Methods of preparing an alkylated salicylamide are also provided.
本发明提供了一种快速、高产量的制备水杨酰胺中间体的方法。该方法包括将水杨酸的C4或更高烷基酯或其衍生物与来自单烷基胺、二烷基胺、氨和上述任何组合的至少一种胺在醇中反应,以产生水杨酰胺。水杨酸的C4或更高烷基酯或其衍生物通常是通过将水杨酸或其衍生物与C4或更高醇在硫酸、磺酸和矿酸中的至少一种存在下反应制备的。从水杨酸或其衍生物制备水杨酰胺中间体的这一过程通常具有约2天的周期时间,并产生约95%的99%纯度物质。相比之下,当使用C3或更低烷基酯代替C4或更高烷基酯时,该过程通常具有7-9天的周期时间,并产生约60%的95%纯度物质。还提供了制备烷基化水杨酰胺的方法。