Discovery and anticonvulsant activity of the potent metabolic inhibitor 4-amino-N-(2,6-dimethylphenyl)-3,5-dimethylbenzamide
作者:David W. Robertson、J. David Leander、Ron Lawson、E. E. Beedle、C. Randall Clark、Brian D. Potts、C. John Parli
DOI:10.1021/jm00393a010
日期:1987.10
mice, plasma concentrations of parent drug and the N-acetyl metabolite 5 were 1.09 and 0.41 microgram/mL, respectively. Six hours postadministration the concentrations were 0.23 and 0.22 microgram/mL, respectively. In order to sterically preclude or diminish the rate of metabolic N-acetylation, we synthesized analogues of 2 possessing either one (3) or two (4) methyl groups ortho to the 4-amino substituent
化合物2 [4-氨基-N-(2,6-二甲基苯基)苯甲酰胺]在几种动物模型中是有效的抗惊厥药。例如,对小鼠口服给药后,它以1.7 mg / kg的ED50拮抗最大的电击(MES)诱发的癫痫发作。在用2进行的药物处置研究中,我们发现它被N-乙酰化迅速代谢。小鼠口服1.7 mg / kg 2的30分钟后,母体药物和N-乙酰代谢产物5的血浆浓度分别为1.09和0.41微克/ mL。给药后6小时,浓度分别为0.23和0.22微克/ mL。为了在空间上排除或减少代谢性N-乙酰化的速率,我们合成了2的类似物,该类似物在4个氨基取代基上具有一个(3)或两个(4)甲基。两种化合物在给予小鼠后均能拮抗MES引起的癫痫发作。3和4的口服ED50值分别为3.5和5.6 mg / kg。化合物3通过N-乙酰化快速代谢。但是,4提供了异常高且长寿命的母体药物血浆浓度;没有检测到N-乙酰代谢产物。虽然2和3对六丁烯苯诱