http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102993205-A

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classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N30-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D487-04
filingDate 2012-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_582d1c95f0b60fa73557391ede1f87f6
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publicationDate 2013-03-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber CN-102993205-A
titleOfInvention A purification method for preparing high-purity sildenafil free base with high yield
abstract The invention belongs to the technical field of medicinal chemistry and relates to a method for purifying sildenafil free base, in particular to a purification method for removing new impurities from sildenafil free base. The method of the present invention comprises the following steps: take the crude product of sildenafil free base (II), add 1-6 times the amount (v/w) of organic solvent, heat up to 40-60°C after fully stirring, and keep stirring 1-6h, then cooled to room temperature, filtered, and dried to obtain the fine product of sildenafil free base (II).
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priorityDate 2012-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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Total number of triples: 34.