Process for making an optically active 3,4-dihydro-3,4-epoxy-2H-1-benzopyran compound
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United States of America Patent
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Dec 28, 1993
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app pub date -
Oct 19, 1992
filing date -
May 11, 1990
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Abstract
The present invention provides an industrially valuable method for preparing an optically active 3,4-dihydro-3,4-epoxy-2H-1-benzopyran compound which is useful as a starting material for an optically active benzopyran compound with antihypertensive, coronary blood flow-increasing activities and the like, provides a diastereomeric ester compound which is useful as an intermediate for said epoxy compound and also provides a use of said diastereomeric ester compound in making of said epoxy compound, and further an optically active benzopyran compound which is useful as medicine.
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