Process for preparation of 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives
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United States of America Patent
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Jan 13, 2004
Grant Date -
Oct 2, 2003
app pub date -
Mar 14, 2003
filing date -
Sep 18, 2000
priority date (Note) -
Expired
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Abstract
The present invention provides a method of industrially advantageously producing 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivatives under mild conditions in a high yield. The present invention relates to a production method of a 7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid derivative of the formula (III) or the formula (IV), which comprises reacting an .alpha.,.beta.-unsaturated carboxylic acid of the formula (I) with a furan derivative of the formula (II) in the presence of a Lewis acid: ##STR1## wherein each symbol is as defined in the specification.
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