http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2017369521-A1

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filingDate 2017-02-07-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1e9104b40609927d06f4eebdb203fcfb
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0819becd521cf54a38120d7fad8df928
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publicationDate 2017-12-28-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-2017369521-A1
titleOfInvention Process for the preparation of estetrol
abstract The present invention relates to a process for the preparation of estra-1,3,5(10)-trien-3, 15a, 16a, 1713-tetraol (estetr-01), via a silyl enol ether derivative 17-B-oxy-3-A-oxy-estra-1,3,5(10), 16-tetraene, wherein A is a protecting group and B is —Si(R 2 ) 3 . The invention further relates to a process for the synthesis of 3-A-oxy-estra-1,3,5(10), 15-tetraen-17-one, in which A is a protecting group, via silyl enol ether derivative 17-B-oxy-3-A-oxy-estra-1,3,5(10),16-tetraene, and B is —Si(R 2 ) 3 .
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