5-[4-(3,3-Dimethylbutoxycarbonyl)phenyl]-4-pentynoic acid and its derivatives inhibit ionotropic γ-aminobutyric acid receptors by binding to the 4′-ethynyl-4-n-propylbicycloorthobenzoate site
作者:Hiroshi Hamano、Keiichi Nagata、Nobuo Fukada、Hiroshi Shimotahira、Xiu-Lian Ju、Yoshihisa Ozoe
DOI:10.1016/s0968-0896(00)00009-2
日期:2000.3
ionotropic gamma-aminobutyric acid (GABA) receptors, bearing an ester or ether linkage, were designed, synthesized, and assayed for their inhibition of the specific binding of [3H]4'-ethynyl-4-n-propylbicycloorthobenzoate (EBOB), a radiolabeled noncompetitive antagonist, to rat brain and housefly head membranes. 5-[4-(3,3-Dimethylbutoxycarbonyl)phenyl]-4-pentynoic acid (DBCPP), a butyl benzoate analogue
设计,合成并合成了具有酯或醚键的离子型γ-氨基丁酸(GABA)受体的无环非竞争性拮抗剂,并测定了它们对[3H] 4'-乙炔基-4-n-丙基双环原苯甲酸酯的特异性结合的抑制作用( EBOB),一种放射性标记的非竞争性拮抗剂,对大鼠的大脑和家蝇的头膜。发现苯甲酸丁酯类似物5- [4-(3,3-二甲基丁氧基羰基)苯基] -4-戊酸(DBCPP)竞争性抑制大鼠脑膜中[3H] EBOB的结合,IC50为88 nM。由p-取代基赋予的效力按C(三键)C(CH2)2COOH> C(三键)C(CH2)2COOCH3> C(三键)CH> Br的顺序降低。与苯甲酸丁酯相比,戊基苯基醚具有同等效力,而戊酸苯基酯和苄基丁基醚的蓬松度较低。这些化合物通常在家蝇头膜中的活性低于在大鼠脑膜中的活性。在苯甲酸丁酯和两个苄基丁基醚的3,3-二甲基丁基的1位上引入异丙基会导致家蝇GABA受体的效力增加,而在其他化合物相应位置