7.alpha.-hydroxy-pregn-4-en-3-one-20-carbaldehyde, process for producing the same, and process for producing 7.alpha., 21-dihydroxy-20-methyl-pregn-4-en-3-one from the same
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United States of America Patent
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Dec 26, 2006
Grant Date -
Nov 25, 2004
app pub date -
Jul 30, 2002
filing date -
Sep 4, 2001
priority date (Note) -
Expired
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Abstract
7.alpha.-Hydroxy-pregn-4-en-3-one-20-carbaldehyde, a production method thereof and a method for producing 7.alpha.,21 -dihydroxy-20-methyl-pregn-4-en-3-one, which is useful as a synthetic intermediate for pharmaceuticals such as squalamine and the like, efficiently at high purity from the carbaldehyde.
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