| 摘要 |
Novel benzopyran and benzoxazine derivatives represented by the general formula: wherein R1 and R2 represent a lower haloalkyl group, R3 represents a hydrogen atom, etc., R4 represents a heterocyclic group or A-O- wherein A represents a cyclic structure, etc., R5 and R6 represent a lower haloalkyl, X represents =N-, N->O, etc, are disclosed. These compounds exhibit K+ channel opening activating and can be widely used as an anti-asthma drug, an anti-epilepsy drug, etc.
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