Substitution at the ortho position of N-(3,4-dimethyl-5-isoxazolyl) benzenesulfonamide led to the identification of the biphenylsulfonamides as a novel series of endothelin-A (ETA) selective antagonists. Appropriate substitutions on the pendant phenyl ring led to improved binding as well as functional activity. A hydrophobic group such as isobutyl or isopropoxyl was found to be optimal at the 4'-position
N-(3,4-二甲基-5-
异恶唑基)苯磺酰胺在邻位的取代导致将
联苯磺酰胺鉴定为新型的内皮素-A(ETA)选择拮抗剂。苯环侧基上的适当取代导致改进的结合以及功能活性。发现疏
水基团例如异丁基或异丙氧基在4'-位是最佳的。在2'-位引入
氨基也导致改进的类似物。最佳的4'-异丁基取代基与2'-
氨基官能团的结合提供了具有改善的ETA结合亲和力和功能活性的类似物(20,BMS-187308)。化合物20在抑制大鼠ET-1输注引起的升压作用方面也具有良好的口服活性。