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。