regioselectivity was not observed in any of these reactions. However, the synthesis of s-triazino[1,2-a]benzimidazole system was found to be more regioselective than its 3,4-dihydro analogue. NOESY experiment indicated that the compound, 2-amino-4,4-dimethyl-3,4-dihydro-s-triazino[1,2-a]benzimidazole existed predominantly as the 3,4-dihydro tautomer in dimethyl sulfoxide. It was found to inhibit bovine dihydrofolate
2-
氨基的合成小号-triazino [1,2一]
苯并咪唑由2- guanidinobenzimidazoles通过一个环成环反应顺利进行。研究了5-甲基-
2-胍基苯并咪唑与偶氮二
羧酸二
乙酯,醛,
丙酮,
乙氧基亚甲基丙二酸二乙酯和原酸酯的闭环区域
化学,导致形成s-
三嗪环。在任何这些反应中均未观察到高区域选择性。然而,发现s-三嗪并[1,2- a ]
苯并咪唑系统的合成比其3,4-二氢类似物具有更高的区域选择性。NOESY实验表明,化合物,2-
氨基-4,4-二甲基-3,4-二氢小号-triazino [1,2一]
苯并咪唑主要以3,4-二氢互变异构体的形式存在于
二甲基亚砜中。发现抑制IC 50 10.9μM的牛二氢叶酸还原酶。