Glycerol and acetic acid assisted mild strategy for facile synthesis of 3-heteroarylcoumarins via three-component reaction
作者:Jiali Gao、Ao Liu、Minghang Li、Yuying Wang、Yudi Xiao、Chengwei Lü、Yue An
DOI:10.1007/s11164-021-04464-0
日期:2021.8
A feasible and inexpensive reaction system for synthesis of 3-benzoxazol-2-yl-chromen-2-one as a kind of 3-heteroarylcoumarins has been developed. Both acetic acid and glycerol are simple, cheap and common chemicals, the combination of them could smoothly accelerate the three-component one-pot reaction of salicylaldehyde, o-aminophenol and ethyl cyanoacetate to yield 3-heteroarylcoumarins. This process
one-pot synthesis method of 3-heterocycle substitutued coumarin derivatives was reported. 3-(2'-benzoxazole)2H-l-benzopyran-2-one derivatives were synthesized from substituted salicylaldehydes, o-aminophenols and ethyl cyanoacetate in n-butanol under the benzoic acid catalysis in one-pot reaction. This one-pot synthesis has a wide substrate scope and the salicylaldehydes with electron-donating group gave
报道了一种新的 3-杂环取代香豆素衍生物的一锅法合成方法。3-(2'-benzoxazole)2H-l-benzopyran-2-one 衍生物是由取代的水杨醛、邻氨基苯酚和氰基乙酸乙酯在正丁醇中在苯甲酸催化下在一锅反应中合成的。这种一锅法合成具有广泛的底物范围,并且具有给电子基团的水杨醛收率良好。香豆素衍生物通过简单的过滤以高纯度和良好的收率获得,并通过 1 H NMR和MS表征。推测可能的机制。该反应具有弱酸催化、反应时间短、实验步骤简单、产品纯度高等特点。
Mild and efficient prepare disperse yellow 184, disperse yellow 232 and their analogues via LTTM promoted three-component reaction
作者:Yudi Xiao、Ao Liu、Jiali Gao、Yizhen Zou、Chengwei Lü、Yue An
DOI:10.1016/j.dyepig.2020.108415
日期:2020.8
A convenient protocol for the synthesis of disperse yellow 184, disperse yellow 232 and their analogues via a three-component one-pot reaction of salicylaldehyde, o-aminophenol and ethyl cyanoacetate has been established. Cheap and eco-friendly ethanol was employed as solvent. One drop of low-transition-temperature mixture (LTTM) which formed from l(−)-Proline and oxalic acid could smoothly promote
One-pot catalyst-free synthesis of 3-heterocyclic coumarins
作者:Shaoliang Jiang、Jianrong Gao、Liang Han
DOI:10.1007/s11164-015-2070-x
日期:2016.2
3-Heterocyclic coumarins were prepared in one-pot three-component reaction without catalyst. The mixture of salicylaldehydes, ethyl cyanoacetate, and o-aminophenols or o-phenylenediamines in refluxing n-butanol gave title compounds with good yields and high purity. Short reaction time, mild reaction condition, simple workup, and less waste are significant advantages of the presented method.
Direct C–H cross-coupling approach to heteroaryl coumarins
作者:Minsik Min、Bomi Kim、Sungwoo Hong
DOI:10.1039/c2ob07137a
日期:——
A Pd-catalyzed direct cross-coupling of 3-bromocoumarins with heteroarenes provided an efficient route to synthesizing 3-heteroarylcoumarins. The reaction scope for the transformation was fairly broad, affording modest to good yields of various 3-heteroarylcoumarin scaffolds, which are privileged structures and prevalent motifs in many biologically active compounds and fluorophores.