Steroid intermediate products and method of their production
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United States of America Patent
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Nov 3, 1998
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N/A
app pub date -
Sep 9, 1994
filing date -
Sep 10, 1993
priority date (Note) -
Expired
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Abstract
The invention is directed to novel steroid intermediate products of general formula I ##STR1## The steroid intermediate products which can be isolated according to the invention are suitable for the synthesis of 13-ethyl-11-methylene-18,19-bisnor-17.alpha.-pregn-4-en-20-in-17-ol (desogestrel). Further, processes for producing the steroid intermediate products of general formula I are described. The olefination of the 11-oxo steroids is carried out under the influence of ultrasound.
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