Mf. Chan et al., HALOGEN SUBSTITUTION AT THE ISOXAZOLE RING ENHANCES THE ACTIVITY OF N-(ISOXAZOLYL)SULFONAMIDE ENDOTHELIN ANTAGONISTS, Bioorganic & medicinal chemistry letters, 6(20), 1996, pp. 2393-2398
Replacement of the 4-methyl group in a series of N-(3, 4-dimethylisoxa
zolyl)benzenesulfonamide endothelin antagonists with a bromine or chlo
rine atom resulted in a three- to ten-fold increase in the binding aff
inity for both the ET(A) and ET(B) receptors. This potentiation in act
ivities was also observed for naphthalene and biphenylsulfonamide endo
thelin antagonists. Copyright (C) 1996 Elsevier Science Ltd.