Michael-Aldol Double Elimination Cascade to Make Pyridines: Use of Chromone for the Synthesis of Indolizines
作者:Dirgha Raj Joshi、Ikyon Kim
DOI:10.1021/acs.joc.1c00981
日期:2021.8.6
having two different acyl groups at the C5 and C7 positions is described where chromone is employed as a two-carbon unit for the synthesis of a pyridine moiety for the first time. Various analogues were readily accessed in good yields under metal-free and eco-friendly conditions. Further manipulation of the resulting products allowed entry to novel indolizine-heterocycle adducts, which are difficult to
One-pot transition-metal-free cascade synthesis of thieno[2,3-c]coumarins from chromones
作者:Yuhong Yang、Xueyu Qi、Ruiling Liu、Qian He、Chunhao Yang
DOI:10.1039/c6ra21776a
日期:——
base-mediated synthesis of a novel series of functionalized thieno[2,3-c]coumarins via a cascade reaction fromchromones has been developed. This cascade reaction involves a Michael addition–Knoevenagel condensation–intramolecular cyclization. This transformation proceeds under mild conditions and gives various thieno[2,3-c]coumarins in good-to-excellent yields. The methodology is tolerant of a wide range
通过色酮的级联反应,开发了一种新型的功能化噻吩并[2,3- c ]香豆素系列产品,可通过一锅法无过渡金属的碱介导合成。该级联反应涉及迈克尔加成-诺文雅格尔缩合-分子内环化。该转化在温和的条件下进行,并以良好至优异的产率得到各种噻吩并[2,3- c ]香豆素。该方法可以耐受多种官能团,并适用于文库合成。