1117893-66-9Relevant academic research and scientific papers
Preparation method of anticoagulant drug dabigatran etexilate and analogues thereof
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Paragraph 0060; 0062; 0065-0066, (2020/05/01)
The invention discloses a preparation method of an anticoagulant drug dabigatran etexilate and analogues thereof. The preparation method comprises the following steps: 3-[(3-amino-4-methylaminobenzoyl)pyridin-2-ylamino]propionic acid ethyl ester (DGM1) and isopropyl 2-(4-cyanophenylamino)acetate (DGM2) which are taken as reaction initial raw materials undergo a docking reaction under the action ofan alkali reagent and a condensing agent to prepare an intermediate DG1; the intermediate DG1 reacts in an alcohol solvent to produce imino ester, and acid catalysis and ammonia reaction are carriedout to prepare a formamidine compound; an intermediate DG2 reacts with n-hexyl chloroformate under the action of the alkali reagent to remove one molecule of water and form an amido bond in order to obtain dabigatran etexilate; and the dabigatran etexilate analogues DG-D1 to DG-D4 are prepared from the dabigatran etexilate and its intermediate DG2. The preparation method of the dabigatran etexilate and analogues thereof has the advantages of short and feasible synthesis route, simplicity in operation, high product yield is high, and suitableness for large-scale industrial production.
NOVEL REFERENCE MARKERS OF DABIGATRAN ETEXILATE
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Page/Page column 18, (2013/03/26)
A new method of obtaining chemically pure and pharmaceutically acceptable Dabigatran Etexilate or its pharmaceutical acceptable salt having purity at least about 99% is provided, wherein the content of Dabigatran Etexilate individual impurity is less than 0.03-0.15% as measured by HPLC. A method of removing specific impurities that are generated either due to the intrinsic instability of Dabigatran Etexilate or in process of its preparation is provided too.
