Process for the preparation of flavone derivatives
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United States of America Patent
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Mar 7, 2006
Grant Date -
Mar 25, 2004
app pub date -
Jan 12, 2002
filing date -
Feb 1, 2001
priority date (Note) -
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Abstract
The invention relates to a process for the preparation of flavone derivatives in which a 2-hydroxyacetophenone compound is metallated using a lithium compound at low temperatures and subsequently reacted with a keto compound, and where the ratio of the molar equivalents of lithium compound to the 2-hydroxyacetophenone compound functional groups to be metallated is from 1 to 1.2. The resultant β-diketone compound is subsequently cyclized with warming in an acidic medium.
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