【摘 要】
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Photoinduced cycloaddition(PCA)is known to be useful for the syntheses of polycyclic compounds.Unlike other method such as transition-metal catalyzed reacti
【机 构】
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School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004
【出 处】
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中国化学会全国第十二届有机合成化学学术研讨会
论文部分内容阅读
Photoinduced cycloaddition(PCA)is known to be useful for the syntheses of polycyclic compounds.Unlike other method such as transition-metal catalyzed reaction,it is very effective and clean.In this report,we found that the irradiation of 6-methyl-3,4-dichlolro-coumarin and 2,3-dimethoxybutandiene will afford the ring expansion benzocoumarin product,which is part of some similar structure in natural product.This reaction might happen through the 1,4-biradical-allylic exchange-1,6-biradical recombination pathway to give the cycloproduct as intermediate and loss of hydrogen chloride to give the aromatic compound.The yield of this reaction still needs to be improved and the reaction mode will be helpful to construct important polycyclic compound.
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