Eco-friendly decarboxylative cyclization in water: practical access to the anti-malarial 4-quinolones
作者:Yue Ma、Yongping Zhu、Dong Zhang、Yuqing Meng、Tian Tang、Kun Wang、Ji Ma、Jigang Wang、Peng Sun
DOI:10.1039/c8gc03570a
日期:——
An eco-friendly decaboxylative cyclization in water has been developed to construct 4-quinolones from readily available isatoic anhydrides and 1,3-dicarbonyl compounds.
Reactions of N-Hydroxysuccinimide Esters of Anthranilic Acids with Anions of .BETA.-Keto Esters. A New Route to 4-Oxo-3-quinolinecarboxylic Acid Derivatives.
A new approach for the synthesis of 4-oxo-3-quinolinecarboxylic acid derivtives is described. This methodology involves the C-acylation of the anions of appropriate β-keto esters with novel N-hydroxysuccinimide esters of anthranilic acids. The intermediate C-acylation products 3 are spontaneously cyclized to afford 3-ethoxycarbonyl-4-oxoquinoline derivatives 4. The introduction of a variety of substituents at positins 1 and 2 of the quinoline ring is feasible with the selection of suitable anthranilic acids and β-keto esters. The structure of the obtained 2-substituted 3-ethoxycarbonyl-4-oxoquinolines was confirmed by IR and NMR spectral data.