- A advantage Ralli sandbank intermediate and its preparation method and application
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The present invention relates to a linagliptin intermediate, a preparation method and applications thereof, wherein the linagliptin intermediate has the structure represented by general formulas (II) and (IV), and X is halogen. According to the present invention, the compound of the present invention is the solid and has characteristics of low production cost, easy purification and easy storage, linagliptin can be efficiently prepared, and the method is suitable for industrial scale production.
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Paragraph 0173; 0174; 0175
(2017/08/25)
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