Combined Alkylating Agents as a Resolution for Highly Selective N-Alkylation of 2-Hydroxybenzaldehyde Acylhydrazones
作者:Qiao Y. Zhang、Xin J. Cheng、Xin Y. Zhao、La M. Wu、Long F. Jin、Hui J. Zhang
DOI:10.1055/s-0037-1611823
日期:2019.7
Although 2-hydroxybenzaldehyde acylhydrazones, such as salicylaldehyde acylhydrazones, are intriguing bioactive molecules, few of their N-alkylated derivatives are known, and only methyl analogues have been reported previously. We achieved selective N-alkylation of 2-hydroxybenzaldehyde acylhydrazones, as their Fe(III) complexes, by using combinations of alkylating agents (for example, an alkyl bromide
虽然 2-羟基苯甲醛酰腙,如水杨醛酰腙,是有趣的生物活性分子,但很少有人知道它们的 N-烷基化衍生物,而且以前只报道过甲基类似物。我们通过使用烷基化剂(例如,烷基溴和二烷基硫酸盐)的组合,实现了 2-羟基苯甲醛酰基腙作为其 Fe(III) 络合物的选择性 N-烷基化。检查了 15 种底物,并以中等至良好的产率合成了 45 种新的 2-羟基苯甲醛酰基(烷基)腙。在所有情况下,目标产物都得到了唯一的结果,没有产生 O-烷基化副产物。该方法为制备2-羟基苯甲醛酰基(烷基)腙提供了一种有效的途径。