Copper-catalyzedsynthesis of imidazo[1,5-a]pyridine-1-carboxylates through oxidative amination of C(sp3)–H bonds under mild aerobic conditions with broad substrate scope is described. Use of naturally abundant air as the sole oxidant was found to be efficient and selective. The present protocol is also applicable for direct synthesis of functionalized imidazo[1,5-a]pyridines from amino acid derivatives
铜催化的咪唑并[1,5 - a ]吡啶-1-羧酸铜的合成在温和的好氧条件下通过广泛的底物范围内的C(sp 3)-H键的氧化胺化进行了描述。发现使用自然丰富的空气作为唯一氧化剂是有效和选择性的。本协议也适用于从氨基酸衍生物直接合成功能化的咪唑并[1,5- a ]吡啶。
Mild Metal-Free Sequential Dual Oxidative Amination of C(sp<sup>3</sup>)–H bonds: Efficient Synthesis of Imidazo[1,5-<i>a</i>]pyridines
作者:Yizhe Yan、Yonghui Zhang、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/ol4008487
日期:2013.5.3
A metal-free sequential dual oxidative amination of C(sp3)–H bonds under ambient conditions was the first developed, affording imidazo[1,5-a]pyridines in good to excellent yields. The reaction was involved in two oxidative C–N couplings and one oxidative dehydrogenation process with six hydrogen atoms removed.
首次开发了在环境条件下无金属的C(sp 3)-H键的顺序双氧化胺化反应,可提供咪唑并[1,5- a ]吡啶,并具有良好或优异的收率。该反应涉及两个氧化C–N偶联和一个氧化脱氢过程,其中去除了六个氢原子。
Diiodine-Mediated Oxidative Reaction for the Construction of Imidazo[1,5-a]pyridines under Metal-Free Conditions
An efficient and general protocol has been developed for preparing imidazo[1,5-a]pyridines in moderate to excellent yields by an I2-mediated sequential dual oxidative C(sp3)–H amination of ethyl pyridin-2-ylacetates with benzylamines. The metal- and peroxide-free reaction involves oxidative dehydrogenation and two C–N couplings.