DDQ-Mediated Tandem Synthesis of Functionalized Pyranocoumarins from 4-Hydroxycoumarins and 1,3-Diarylallylic Compounds
作者:Xufeng Lin、Zhenxing He、Yuanxun Zhu、Yanguang Wang
DOI:10.3987/com-10-11906
日期:——
simple and efficient DDQ-mediated oxidative cross-coupling between 4-hydroxycoumarin and 1,3-diarylallylic compounds was developed. The reaction furnished functionalized pyranocoumarins in a single step without using any metal catalyst. The tandem process involves an intermolecular C-Cbondformation and an intramolecular C-Obondformation through double oxidative C-H activation.
开发了一种简单有效的 DDQ 介导的 4-羟基香豆素和 1,3-二芳基烯丙基化合物之间的氧化交叉偶联。该反应在一个步骤中提供了官能化的吡喃香豆素,而不使用任何金属催化剂。串联过程涉及通过双氧化 CH 活化形成分子间 CC 键和形成分子内 CO 键。
Regioselective synthesis of pyrano[3,2-c]coumarins via Cu(II)-catalyzed tandem reaction
Efficient synthesis of pyrano[3,2-c]coumarins has been achieved via copper(II) triflate catalyzed tandem reaction of 4-hydroxycoumarin with α,β-unsaturated carbonyl compounds in high yields. The catalytic reaction proceeded very smoothly under solvent-free conditions and showed high regioselectivity. The synthetic potential of this methodology was explored to 4-hydroxy-6-methyl-2-pyrone successfully
吡喃并[3,2- c ]香豆素的有效合成已通过三氟甲磺酸铜(II)催化4-羟基香豆素与α,β-不饱和羰基化合物的串联反应以高收率实现。在无溶剂条件下,催化反应进行得非常顺利,并具有很高的区域选择性。该方法的合成潜力已成功地探索为4-羟基-6-甲基-2-吡喃酮。
Gold(III)-Catalyzed Tandem Conjugate Addition/Annulation of 4-Hydroxycoumarins with α,β-Unsaturated Ketones
efficient and selective approach for the synthesis of functionalized pyranocoumarins has been developed via a gold(III)-catalyzed tandem conjugate addition/annulation reaction of 4-hydroxycoumarins with α,β-unsaturatedketones.