A facile synthetic method for benzothiazoles and benzoxazoles comprising the reaction of corresponding 2-aminothiophenol and 2-aminophenol with various substituted aromatic carboxylic acids using Samarium(III) triflate as a catalyst has been described. The advantages of the method are short reaction times and aqueous reaction media and easy work-up. The catalysts can be recovered for the subsequent reactions and reused without any appreciable loss of efficiency.
介绍了一种
苯并噻唑和
苯并恶唑的简便合成方法,包括使用三酸
钐(III)作为催化剂,使相应的 2-
氨基
苯硫酚和
2-氨基苯酚与各种取代的芳香族
羧酸反应。该方法的优点是反应时间短,采用
水性反应介质,易于操作。催化剂可回收用于后续反应,并可重复使用,而不会明显降低效率。