使用苯肼和乙醛合成吲哚得到 1 H -吲哚,而苯肼与丙二醛反应得到 1 H -吲哚-3-甲醛。1 H -吲哚的 Vilsmeier-Haack 甲酰化也得到 1 H -吲哚-3-甲醛。1 H -Indole-3-carbaldehyde 被氧化形成 1 H -Indole-3-carboxylic acid。1 H -Indole 在 -78 °C 下使用干冰与过量的 BuLi 反应也得到 1 H -Indole-3-carboxylic acid。将获得的 1 H-吲哚-3-羧酸转化为酯,并将酯转化为酰肼。最后 1 H-Indole-3-carboxylic acid hydrazide 与取代的羧酸反应得到具有微生物活性的吲哚取代的恶二唑。与链霉素相比,合成化合物9a - j显示出对金黄色葡萄球菌有前景的体外抗微生物活性。与标准品相比,化合物9a、9f和9g显示出抗大肠杆菌的活性。与参考标准相比,发现化合物9a和9f对B
An efficient synthesis and biological study of novel indolyl-1,3,4-oxadiazoles as potent anticancer agents
作者:Dalip Kumar、Swapna Sundaree、Emmanuel O. Johnson、Kavita Shah
DOI:10.1016/j.bmcl.2009.03.172
日期:2009.8
A facile, convenient and high yielding synthesis of a series of novel 5-(3′-indolyl)-2-(substituted)-1,3,4-oxadiazoles from readily available starting materials has been described. The key step of this protocol is oxidativecyclization of N-acylhydrazones 1 using [bis(trifluoroacetoxy)iodo]benzene under solvent-free condition. The 5-(3′-indolyl)-2-(substituted)-1,3,4-oxadiazoles were screened for their