Processes for preparing optically active 3,4-dihydro-3,4-...

Details Processes for preparing optically active 3,4-dihydro-3,4-... Processes for preparing optically active 3,4-dihydro-3,4-...

C - Chemistry, Metallurgy

07

D

260/356, 260/328

C07D 311/04 (2006.01) C07D 311/22 (2006.01) C07D 405/12 (2006.01) C07D 407/12 (2006.01) C07D 409/12 (2006.01) C07D 493/04 (2006.01)

Patent

CA 2011381

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, and also provides a diastereomeric ester com- pound with a 3-halo-4-hydroxy-2H-1-benzopyran compound which is useful as an intermediate for said epoxy compound.

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