Study on the syhthesis process of tetracaine hydrochloride

International Symposium on Resource Exploration and Environmental Science

地球科学;生态环境科学

Li, Wenli^1 ; Zhao, Jie^1 ; Cui, Yujie^1

Chong Qing Energy College, Jinan Depton Chemical Technology Co., Ltd, China^1

关键词: Clinical application;    Hydrochloride salts;    Mild reaction conditions;    P-nitrobenzoic acids;    Physical and chemical properties;    Short reaction time;    Synthetic technology;    Tetracaine hydrochloride;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/64/1/012108/pdf
DOI  :  10.1088/1755-1315/64/1/012108

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Tetrachloride hydrochloride is a local anesthetic with long-acting ester, and it is usually present in the form of a hydrochloride salt. Firsleb first synthesized the tetracaine by experiment in 1928, which is one of the recognized clinical potent anesthetics. This medicine has the advantages of stable physical and chemical properties, the rapid role and long maintenance. Tetracaine is also used for ophthalmic surface anesthesia as one of the main local anesthetic just like conduction block anesthesia, mucosal surface anesthesia and epidural anesthesia. So far, the research mainly engaged in its clinical application research, and the research strength is relatively small in the field of synthetic technology. The general cost of the existing production process is high, and the yield is low. In addition, the reaction time is long and the reaction conditions are harsh. In this paper, a new synthetic method was proposed for the synthesis of tetracaine hydrochloride. The reaction route has the advantages of few steps, high yield, short reaction time and mild reaction conditions. The cheap p-nitrobenzoic acid was selected as raw material. By esterification with ethanol and reaction with n-butyraldehyde (the reaction process includes nitro reduction, aldol condensation and hydrogenation reduction), the intermediate was transesterified with dimethylaminoethanol under basic conditions. Finally, the PH value was adjusted in the ethanol solvent. After experiencing 4 steps reaction, the crude tetracaine hydrochloride was obtained.