Synthesis and benzodiazepine receptor affinities of rigid analogs of 3-carboxy-.beta.-carbolines: demonstration that the benzodiazepine receptor recognizes preferentially the s-cis conformation of the 3-carboxy group
作者:Gilbert Dorey、Guillaume Poissonnet、Marie Claude Potier、Lia Prado De Carvalho、Patrice Venault、Georges Chapouthier、Jean Rossier、Pierre Potier、Robert H. Dodd
DOI:10.1021/jm00128a023
日期:1989.8
1H-Indolo[3',2':4,5]pyrido[3,2-b]-2-penten-5-olide (6) and 1H,5H-indolo[3',2'-c]-6,7-dihydro-2-pyridone (7), rigid analogues of methyl 4-ethyl-beta-carboline-3-carboxylate (8) and N-methyl-4-ethyl-beta-carboline-3-carboxamide (9), respectively, were synthesized and their in vitro binding affinities to the central type benzodiazepine receptors were compared. The IC50 values of 6 and 8 were approximately
1H-吲哚并[3',2':4,5]吡啶[3,2-b] -2-戊烯-5-乙酰胺(6)和1H,5H-吲哚并[3',2'-c] -6 ,7-二氢-2-吡啶酮(7),4-乙基-β-咔啉-3-羧酸甲酯(8)和N-甲基-4-乙基-β-咔啉-3-羧酰胺(9)的刚性类似物,分别合成,并比较了它们与中枢型苯并二氮杂receptor受体的体外结合亲和力。6和8的IC50值大约相等(分别为42和27 nM)。酰胺衍生物9显示出非常低的亲和力(IC50大于10(4)nM),酰胺衍生物9的理论能量计算表明它是优选的顺式-反羰基构象。但是,当像内酰胺7一样,当9的羰基被迫采用s-顺式构象时,与苯并二氮杂receptor受体的结合被大大恢复(IC50 = 150 nM),表明该受体优先识别β-咔啉在C-3处的s-顺式羧基构象。在体内,化合物6在小鼠中既不显示惊厥,前惊厥活性,也不显示抗惊厥活性。此外,6没有拮抗小鼠