Studies in the heterocyclic series. XVI. Open azaphenothiazines as new central nervous system depressants.
作者:C.O. OKAFOR、M.L. STEENBERG、J.P. BUCKLEY
DOI:10.1248/cpb.30.302
日期:——
Acid-catalyzed condensation of 2-amino-3-mercapto-6-methylpyridine and 3-amino-pyridine-2 [1H]-thiones with 4-chloropyrimidines having free 5-carbon centers gave N-(3-mercapto-2-pyridyl)-6-pyrimidinylamines and N-(2-thioxo-3-pyridyl)-6-pyrimidinyl-amines, which we have described as open 1, 3, 9-triaza- and 1, 3, 6-triaza-phenothiazines, respectively. A newly developed method of reducing nitro groups was used for preparing the aminopyridine precursors. Eight new and five related compounds including an open 1, 9-diazaphenoxazine were tested in rats and mice and found to display central nervous system (CNS)-depressant activities. The most active compound in the series is N-(6-chloro-2 [1H]-thioxo-3-pyridyl)-2, 4-diamino-6-pyrimidinylamine, an open 1, 3, 6-triaza-phenothiazine derivative. Structure-activity correlations are discussed on the basis of the biological data.
酸催化的2-氨基-3-巯基-6-甲基吡啶与3-氨基-吡啶-2[1H]-硫酮与具有游离5碳中心的4-氯嘧啶进行缩合反应,得到了N-(3-巯基-2-吡啶基)-6-嘧啶基胺和N-(2-硫杂-3-吡啶基)-6-嘧啶基胺,我们将其描述为开放的1, 3, 9-三氮-和1, 3, 6-三氮-苯噻嗪。一种新开发的还原硝基的方法用于制备氨基吡啶前体。对八种新化合物和五种相关化合物(包括一个开放的1, 9-二氮苯氧噻嗪)进行了小鼠和大鼠的测试,发现它们具有中枢神经系统(CNS)抑制活性。该系列中最活跃的化合物是N-(6-氯-2[1H]-硫杂-3-吡啶基)-2, 4-二氨基-6-嘧啶基胺,一种开放的1, 3, 6-三氮-苯噻嗪衍生物。基于生物数据讨论了结构-活性关系。