4-Chloro-3-(trifluoroacetyl)- and 4-chloro-3-(methoxalyl)coumarins as novel and efficient building blocks for the regioselective synthesis of 3,4-fused coumarins
作者:Viktor O. Iaroshenko、Friedrich Erben、Satenik Mkrtchyan、Ani Hakobyan、Marcelo Vilches-Herrera、Sergii Dudkin、Alina Bunescu、Alexander Villinger、Vyacheslav Ya. Sosnovskikh、Peter Langer
DOI:10.1016/j.tet.2011.08.030
日期:2011.10
4-chloro-3-(methoxalyl)coumarins react with electron-rich aminoheterocycles, dimethyl 1,3-acetonedicarboxylate, hydrazines, alkyl thioglycolates, and methyl sarcosinate to give a variety of 3,4-heteroannulated coumarins. The starting materials were prepared by the reaction of 4-hydroxycoumarin with trifluoroacetic anhydride and methyl 2-chloro-2-oxoacetate in the presence of trimethylsilylchloride.
Domino Reactions of Chromone-3-carboxylic Acids with Aminoheterocycles: Synthesis of Heteroannulated Pyrido[2,3-<i>c</i>
]coumarins and their Optical and Biological Activity
A variety of new heteroannulated pyrido[2,3‐c]coumarins have been prepared by the domino reactions of chromone‐3‐carboxylic acids with aminoheterocycles
色酮-3-羧酸与氨基杂环的多米诺反应制备了各种新的杂吡啶并[2,3- c ]香豆素
BRODRICK A.; WIBBERLEY D. G., J. CHEM. SOC. PERKIN TRANS. PART 1, <JCPK-BH>, 1975, NO 19, 1910-1913