Synthesis of α-pyrones by catalytic oxidative coupling of terminal alkynes and carbon dioxide
作者:Saray Oliveros-Cruz、Alma Arévalo、Juventino J. García
DOI:10.1016/j.jorganchem.2016.12.033
日期:2017.3
[(dippe)Ni(μ-H)]2 (1) as a catalyst precursor (10 mol%) in the presence of a variety of terminalalkynes and CO2 allowed the production of substituted α–pyrones. This reaction occurs using relatively mild conditions (50 °C, 150 psi of CO2) with good to modest yields, depending on the nature of the substituents in the corresponding alkyne. The produced α–pyrones were characterized by different analytical methods
在各种末端炔烃和CO 2存在下,使用复合物[(dippe)Ni(μ-H)] 2(1)作为催化剂前体(10摩尔%)可以生产取代的α-吡喃酮。该反应在相对温和的条件下(50°C,150 psi CO 2)进行,其收率良好至中等,具体取决于相应炔烃中取代基的性质。产生的α-吡喃酮通过不同的分析方法和光谱技术进行表征。
Carboxylative cyclization of substituted propenyl ketones using CO<sub>2</sub>: transition-metal-free synthesis of α-pyrones
作者:Wen-Zhen Zhang、Ming-Wang Yang、Xiao-Bing Lu
DOI:10.1039/c6gc01346e
日期:——
Carbon dioxide is a green carboxylative reagent with regard to its non-toxic and renewable property. Described herein is a carboxylative cyclization of substituted 1-propenyl ketones via [gamma]-carboxylation using CO2, which...
Diversity-oriented general protocol for the synthesis of privileged oxygen scaffolds: pyrones, coumarins, benzocoumarins and naphthocoumarins
作者:Atul Goel、Gaurav Taneja、Ashutosh Raghuvanshi、Ruchir Kant、Prakas R. Maulik
DOI:10.1039/c3ob40859k
日期:——
A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studies of