Processes for preparing optically active 3,4-dihydro-3,4-epoxy-2H-1-benzopyran compounds and intermediates therefor.

摘要

The present invention provides an industrially valuable method for preparing optically active 3,4-dihydro-3,4-epoxy-2H-1-benzopyran compounds which are useful as a starting material for optically active benzopyran compounds with antihypertensive, coronary blood flow-increasing activities and the like, and also provides diastereomeric ester compounds with a 3-halo-4-hydroxy-2H-1-benzopyran compound which are useful as an intermediate for said epoxy compounds.