Constructing 5‐Methyl‐2,4‐diaryl‐1<i>H</i>‐imidazoles Using Calcium Carbide as Alkyne Source <i>via</i> A3‐Coupling Cyclization
作者:Lang Liu、Guojin Sun、Jun Zhang
DOI:10.1002/adsc.202300221
日期:2023.6.13
we present a protocol for synthesizing 2,4,5-substituted imidazole-bearing methyl groups using A3-coupling cyclization with calcium carbide as the acetylene source, reacting with amidines and aldehydes. This methodology is characterized by several features, including the utilization of a solid alkyne source, readily accessible starting materials, and applicability to 34 examples.
咪唑衍生物是合成药物、荧光材料和配体的关键组成部分。尽管开发了许多策略,但 2,4,5-取代咪唑的可靠合成仍在大量研究中。在这项研究中,我们提出了一种合成 2,4,5-取代咪唑甲基的方案,使用 A3 偶联环化与碳化钙作为乙炔源,与脒和醛反应。该方法具有几个特点,包括使用固体炔烃源、易于获取的起始材料以及对 34 个示例的适用性。