401566-80-1Relevant articles and documents
AN IMPROVED PROCESS FOR THE PREPARATION OF TENELIGLIPTIN HYDROBROMIDE HYDRATE
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Page/Page column 7-8, (2021/01/23)
The present invention provides an improved process for the preparation of Teneligliptin HBr more particularly relates to a process for the preparation of Teneligliptin 2.5HBr hydrate salt.
Method for preparing hydrobromic acid teneligliptin
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, (2017/07/01)
The invention provides a method for preparing hydrobromic acid teneligliptin. The method includes steps of preparing L-hydroxyproline; mixing the L-hydroxyproline and sodium bicarbonate with each other to obtain mixtures, dissolving the mixtures in water, adding acetone into the water, dropping di-tert-butyl dicarbonate into the water, carrying out room-temperature reaction overnight and then treating reaction products to obtain t-butyloxycarboryl-N-hydroxyproline; preparing t-butyloxycarboryl-N-4-oxo-proline from the t-butyloxycarboryl-N-hydroxyproline; preparing (2S)-4-oxo-2-(3-thiazolidine carbonyl)-1-pyrrolidine carboxylic acid tert-butyl ester from the t-butyloxycarboryl-N-4-oxo-proline; preparing compounds III from compounds IV; preparing compounds II from the compounds III; preparing compounds 1-(3-methyl-1-phenyl-1H-pyrazole-5-base) piperazine from the compounds II; preparing intermediates I; preparing the hydrobromic acid teneligliptin from the intermediates I. The method has the advantages that the method is low in cost, and the cost of the method is only two-thirds of the cost of an existing method in the prior art; the yield of the hydrobromic acid teneligliptin is higher than 95%, and the purity of the hydrobromic acid teneligliptin is higher than 98%.
PROCESS FOR THE PREPARATION OF TENELIGLIPTIN AND ITS NOVEL INTERMEDIATES
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, (2016/01/26)
The present invention relates to a novel process for the preparation of Teneligliptin or its pharmaceutically acceptable salts and its hydrates thereof. The invention also relates to novel intermediates used in the synthesis of Teneligliptin and their preparation.