-(17α)-13-ethyl-17-hydroxy-18,19-dinorpregn-4-ene-20-yn-3-one-oxime
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United States of America Patent
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Oct 19, 2010
Grant Date -
Feb 10, 2005
app pub date -
Jun 30, 2004
filing date -
Jun 30, 2003
priority date (Note) -
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Abstract
The invention relates to a process for the synthesis of d-(17α)-13-ethyl-17-hydroxy-18,19-dinorpregn-4-ene-20-yn-3-one-oxime (also known as norelgestromin) via acetylation of d-norgestrel at position 17; oximation of the oxo group at position 3 of the obtained d-(17α)-13-ethyl-17-(acetyloxy)-18,19-dinorpregn-4-ene-20-yn-3-one; and then hydrolyzing the acetyloxy group at position 17 of the obtained d-(17α)-13-ethyl-17-(acetyloxy)-18,19-dinorpregn-4-ene-20-yn-3-oxime derivative, thereby obtaining norelgestromin.
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