Cooperative Fe/Co-Catalyzed Remote Desaturation for the Synthesis of Unsaturated Amide Derivatives
作者:Yanjun Wan、Emmanuel Ramírez、Ayzia Ford、Harriet K. Zhang、Jack R. Norton、Gang Li
DOI:10.1021/jacs.3c14481
日期:2024.2.21
Unsaturated amides represent common functional groups found in natural products and bioactive molecules and serve as versatile synthetic building blocks. Here, we report an iron(II)/cobalt(II) dual catalytic system for the syntheses of distally unsaturated amide derivatives. The transformation proceeds through an iron nitrenoid-mediated 1,5-hydrogen atom transfer (1,5-HAT) mechanism. Subsequently,
不饱和酰胺代表天然产物和生物活性分子中常见的官能团,可作为多功能合成构件。在这里,我们报道了一种用于合成远端不饱和酰胺衍生物的铁(II)/钴(II)双催化系统。该转化通过铁氮烯介导的 1,5-氢原子转移 (1,5-HAT) 机制进行。随后,自由基中间体在钴肟催化剂的作用下从邻位亚甲基中夺取氢原子,在温和的条件下有效地生成β,γ-或γ,δ-不饱和酰胺衍生物。共介 HAT 的效率可以通过改变不同的辅助设备来调整,突出了该协议的通用性。值得注意的是,这种去饱和方案还适合实际的可扩展性,能够合成不饱和氨基甲酸酯和脲,它们可以很容易地转化为各种有价值的分子。