http://rdf.ncbi.nlm.nih.gov/pubchem/patent/OA-11165-A

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filingDate 1999-10-08-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_dea722f8664edcbc0f60a29f9d51fe8d
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publicationDate 2003-04-22-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber OA-11165-A
titleOfInvention Process for preparation of pyrazoloÄ4,3-dÜpyeimidin-7-ones and intermediates thereof
abstract A process is provided for the preparation of a compound of formulae (IA) (sidenafil/ ViagraTm™) and (IB) comprising reacting a compound of formula (IIA) and (IIB) respectively in the presence of - OR, wherein R in the case of formation of compound (IA) is CH 2 CH 3 and R in the case of formation of compound (IB) is CH2CH2CH3, where X is a leaving group:
priorityDate 1998-10-12-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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