Synthesis of zwitterionic 4-hydroxycoumarin derivatives through a unique reaction of 4-hydroxycoumarins with p- benzoquinone and pyridine |
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| Authors: | Zhang Sheng-Ling Huang Zhi-Shu An Lin-Kun Bu Xian-Zhang Ma Lin Li Yue-Ming Chan Albert S C Gu Lian-Quan |
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| Institution: | School of Pharmaceutical Science, Sun Yat-Sen University, Guangzhou, 510275 People's Republic of China. |
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| Abstract: | reaction: see text] A unique reaction of 4-hydroxycoumarins with p-benzoquinone and pyridine was found, and through the reaction, six zwitterionic 4-hydroxycoumarin derivatives were synthesized. The structures of these compounds were determined by IR, MS(ESI), 1H NMR, 13C NMR, and single-crystal X-ray diffraction studies. |
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