1621679-05-7Relevant articles and documents
For the improvement of the [...] intermediates preparation method
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Paragraph 0253-0255, (2018/02/04)
The invention relates to an improved preparation method for the intermediate 4, 6-dihalogen-2-(propythio)pyrimidine-5-amine used for preparing the anticoagulation drug ticagrelor, and application of the intermediate in preparation of ticagrelor. By use of a phase transfer reagent, the method reduces the halogenating reagent consumption and emission and treatment of toxic substances. Also, the obtained product has high yield and good purity. Thus, the method is a greener and more economical preparation method more suitable for industrial application.