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Variable 7-carboxylpropoxy or (1-phenyl)ethoxybenzo[b]furan derivatives with (E)- and (Z)-2-alkylcarbamoyl-1-methylvinyl groups at the 2-, 4-, and 5-positions were prepared to find novel and selective leukotriene B(4) (LTB(4)) receptor antagonists. (E)-2-(2-Diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (4v) showed selective inhibition of the human BLT(2) receptor (hBLT(2)). On the other hand, (E)-2-acetyl-4-(2-diethylcarbamoyl-1-methylvinyl)-7-(1-phenylethoxy)benzo[b]furan (7c) inhibited both human BLT(1) receptor (hBLT(1)) and hBLT(2). 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 a torsion angle (45.7 degrees ) 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-alkylcarbamoyl-1-methylvinyl groups.

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Synthesis of 2-, 4- and 5-(2-Alkylcarbamoyl-1-methylvinyl)-7-alkyloxybenzo[&lt;i&gt;b&lt;/i&gt;]furans and their Leukotriene B&lt;sub&gt;4&lt;/sub&gt; Receptor Antagonistic Activity