| 摘要 |
The title cpd. of formula (I) and their pharmaceutically acceptable salts are prepd. by reacting a cpd. of formula (II) with a super acid of Hammett acidity function below -12. In the formulas, a,b,c and d are CH, though one may be N; R1,R2,R3 and R4 are each H, C1-6 alkyl or alkoxy, F, Cl, Br, I, NO2 or CF3; R5 is lower alkyl of H. The super acid is HF/BF3, CF3SO3H, CH3SO3H/BF3 or FSO3H. (I) are useful as antihistamines and antiallergics.
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