Divergent Conversion of 4-Naphthoquinone-substituted 4<i>H</i>-Isoxazolones to Different Benzo-fused Indole Derivatives
作者:Michael S. Christodoulou、Sabrina Giofrè、Egle M. Beccalli、Francesca Foschi、Gianluigi Broggini
DOI:10.1021/acs.orglett.0c00709
日期:2020.4.3
reaction conditions. A decarboxylative ring opening/ring closure promoted by catalytic [Ru(p-cymene)2Cl2]2 yields benzo[f]indole-4,9-diones. Alternatively, hydrogenation reactions provide the conversion of 4-(1,4-naphthoquinone)-substituted isoxazol-5-ones to benzo[g]indole compounds, with the level of reduction depending on the substituents present on the ring. Starting materials have been easily prepared
带有1,4-萘醌部分的4,4-二取代的4 H-异恶唑-5-酮根据不同的反应条件转化成不同类型的苯并吲哚基产物。催化[Ru(p- Cymene)2 Cl 2 ] 2促进的脱羧开环/闭环反应生成苯并[ f ]吲哚-4,9-二酮。可选择地,氢化反应提供4-(1,4-萘醌)-取代的异恶唑-5-酮到苯并[ g ]吲哚化合物的转化,其还原水平取决于环上存在的取代基。通过在温和条件下用萘醌将异恶唑啉酮官能化,可以轻松制备起始原料。