Processes for preparing optically active 3,4-dihydro-3,4-epoxy-2

Details Processes for preparing optically active 3,4-dihydro-3,4-epoxy-2 Processes for preparing optically active 3,4-dihydro-3,4-epoxy-2

1991-06-19

1992-11-10

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549345, 549 66, 546269, C07D31122, C07D40512, C07D40912

Patent

active

051625539

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 diastereometric ester compound with a 3-halo-4-hydroxy-2H-1-benzopyran compound which is useful as an intermediate for said epoxy compound.

REFERENCES:
patent: 3599200 (1976-07-01), Arnold
patent: 4062870 (1977-12-01), Watts
patent: 4446113 (1984-04-01), Evans et al.

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