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.
本发明提供了一种具有工业价值的制备光学活性的 3,4-二氢-3,4-环氧-2H-1-苯并
吡喃化合物的方法,该方法可用作具有抗高血压、增加冠状动脉血流量等活性的光学活性苯并
吡喃化合物的起始原料;本发明还提供了具有 3-卤代-
4-羟基-2H-1-苯并
吡喃化合物的非对映酯化合物,该化合物可用作所述环氧化合物的中间体。