Synthesis of β,γ-unsaturated amides via palladium-promoted coupling of organomercurials and vinylic β-lactams
作者:Richard C. Larock、Shuji Ding
DOI:10.1016/s0040-4039(00)99607-2
日期:1989.1
The reaction of aryl or vinylic mercurials, Li2PdCl4 and vinylic β-lactams affords good yields of the corresponding ring-opened β,γ-unsaturated amides.
structurally diverse γ‐functionalized carboxylic acid derivatives in moderate to good yields. The precise chemoselectivity of the reaction among multiple alkene units even in the presence of reactive terminal alkenes highlights the unique catalytic features of manganese catalyst, and the excellent functional group compatibility of primary amides further complements other transition metals.
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。