1421312-32-4Relevant articles and documents
Preparation method of roxadustat intermediate
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Paragraph 0056; 0062; 0067; 0073; 0078; 0084, (2021/04/17)
The invention discloses a preparation method of a roxadustat intermediate. The method comprises the following steps: anhydride ring opening, esterification, ring closing, aromatization, deprotection, chlorination and methylation to obtain the roxadustat intermediate. According to the invention, the preparation method provided by the invention makes full use of the atom economy theory, is easy to operate, low in cost and low in pollution, and is suitable for large-scale industrial production; and only one-time refining is carried out, the chromatographic purity can reach 99.5% or above, and the total yield of the six-step reaction is 30% or above.
CRYSTAL TYPES OF COMPOUNDS INHIBITING ACTIVITY OF PROLYL HYDROXYLASE AND USE THEREOF
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Paragraph 0145; 0155; 0156, (2017/10/27)
The invention relates to crystal types of compound shown as structural formula I, methods of preparing the compound, intermediate, pharmaceutical composition, and use of treating disease or pharmaceutical preparations for treating disease.
POLYMORPHIC FORMS OF COMPOUNDS AS PROLYL HYDROXYLASE INHIBITOR, AND USES THEREOF
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Page/Page column 17, (2013/03/26)
The present invention relates to the polymorphic forms of the compound of Formula (I), preparation thereof including the preparation of intermediates and pharmaceutical compositions, and use of a polymorph above in the treatment of a disease, a disorder o