Variable benzo[b]furan derivatives having (E)- and (Z)-2-alkylcarbamoyl-1-methylvinyl groups at the 2-, 4- and 5-positions and a carboxylpropoxy or (1-phenyl)ethoxy group at the 7-position were prepared to find novel and selective leukotriene B4
(LTB4) receptor antagonists. (E)-2-(2-Diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (4v) showed selective inhibition to the human BLT2 receptor (hBLT2). On the other hand, (E)-2-acetyl-4-(2-diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (7v) inhibited both human BLT1 receptor (hBLT1) and hBLT2. The (E)-2-(2-diethylcarbamoyl-1-methylvinyl) group lay on approximately the same plane as the benzo[b]furan ring, whereas the (E)-4-(2-diethylcarbamoyl-1-methylvinyl) group had the torsion angle (45.7°) from the benzo[b]furan ring plane. However, the (Z)-(2-alkylcarbamoyl-1-methylvinyl)benzo[b]furans were inactive. The inhibitory activity depended on the conformation of the 2-diethylcarbamoyl-1-methylvinyl group.
合成了变种的
苯并[b]
呋喃衍
生物,这些衍
生物在2、4和5位含有(E)-和(Z)-2-烷基
氨基甲酰基-
1-甲基乙烯基基团,而在7位则含有羧丙
氧基或(1-
苯基)乙
氧基基团,以寻找新型的选择性
白三烯B4(LTB4)受体
拮抗剂。(E)-2-(2-
二乙基氨基甲酰基-
1-甲基乙烯基)-7-(1-
苯乙
氧基)
苯并[b]
呋喃(4v)对人类BLT2受体(hBLT2)表现出选择性抑制作用。另一方面,(E)-2-
乙酰基-4-(2-
二乙基氨基甲酰基-
1-甲基乙烯基)-7-(1-
苯乙
氧基)
苯并[b]
呋喃(7v)则同时抑制人类BLT1受体(hBLT1)和hBLT2。(E)-2-(2-
二乙基氨基甲酰基-
1-甲基乙烯基)基团大致位于
苯并[b]
呋喃环的同一平面上,而(E)-4-(2-
二乙基氨基甲酰基-
1-甲基乙烯基)基团与
苯并[b]
呋喃环平面之间的扭转角度为45.7°。然而,(Z)-(2-烷基
氨基甲酰基-
1-甲基乙烯基)
苯并[b]
呋喃表现出不活性。抑制活性取决于2-
二乙基氨基甲酰基-
1-甲基乙烯基基团的构象。