The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2024
Filed:
Feb. 22, 2023
Fudan University, Shanghai, CN;
Fener Chen, Shanghai, CN;
Dang Cheng, Shanghai, CN;
Lulu Wang, Shanghai, CN;
Ge Meng, Shanghai, CN;
Yingtang Ning, Shanghai, CN;
Zedu Huang, Shanghai, CN;
Fudan University, Shanghai, CN;
Abstract
A method of synthesizing diclofenac sodium, including: subjecting aniline and chloroacetic acid to amidation to obtain 2-chloro-N-phenylacetamide; subjecting 2-chloro-N-phenylacetamide and 2,6-dichlorophenol to condensation reaction to obtain 2-(2,6-dichlorophenoxy)-N-phenylacetamide; subjecting 2-(2,6-dichlorophenoxy)-N-phenylacetamide to Smiles rearrangement in the presence of an inorganic base to obtain N-(2,6-dichlorophenyl)-2-hydroxy-N-phenylacetamide; subjecting N-(2,6-dichlorophenyl)-2-hydroxy-N-phenylacetamide and thionyl chloride to chlorination to obtain N-(2,6-dichlorophenyl)-2-chloro-N-phenylacetamide; subjecting N-(2,6-dichlorophenyl)-2-chloro-N-phenylacetamide to Friedel-Crafts alkylation in the presence of a Lewis acid catalyst to obtain 1-(2,6-dichlorophenyl)-1,3-dihydro-2H-indol-2-one; and subjecting 1-(2,6-dichlorophenyl)-1,3-dihydro-2H-indol-2-one to hydrolysis in the presence of an inorganic base to obtain diclofenac sodium.