A Facile Direct Route to
<i>N</i>
‐(Un)substituted Lactams by Cycloamination of Oxocarboxylic Acids without External Hydrogen
作者:Hu Li、Hongguo Wu、Heng Zhang、Yaqiong Su、Song Yang、Emiel J. M. Hensen
DOI:10.1002/cssc.201901780
日期:2019.8.22
Lactams are privileged in bioactive natural products and pharmaceutical agents and widely featured in functional materials. This study presents a novel versatile approach to the direct synthesis of lactams from oxocarboxylic acids without catalyst or external hydrogen. The method involves the in situ release of formic acid from formamides induced by water to facilitate efficient cycloamination. Water
内酰胺在生物活性天然产物和药物制剂中享有特权,并在功能材料中得到广泛应用。这项研究提出了一种新颖的通用方法,无需催化剂或外部氢就可从含氧羧酸直接合成内酰胺。该方法涉及从水诱导的甲酰胺中原位释放甲酸,以促进有效的环胺化。水还抑制副产物的形成。通过模型实验和密度泛函理论计算的结合阐明了这种非常规途径,其中发现环状亚胺(5-甲基-3,4-二氢-2-吡咯烷酮及其互变异构结构)是形成内酰胺的有利中间体。与包括级联还原胺化和环化的常规方法形成对比。N-未取代和N-取代的内酰胺。