Naphthoquinone Diels-Alder Reactions: Approaches to the ABC Ring System of Beticolin
作者:Carsten S. Kramer、Martin Nieger、Stefan Bräse
DOI:10.1002/ejoc.201301763
日期:2014.4
syntheses of highly substituted anthraquinones through Diels–Alder reaction by using naphthoquinones are described. As an application, the first synthesis of the ABC tricycle of beticolin 0 (1) is reported. By using substituted naphthoquinone monoketal dienophiles, the congested quarternary center, the alkenyl methyl group and the oxo-substituent on the C ring could be established in the desired 1,3-relationship
描述了使用萘醌通过 Diels-Alder 反应合成高度取代的蒽醌。作为应用,首次合成了 beticolin 0 (1) 的 ABC 三轮车。通过使用取代的萘醌单缩酮亲二烯体,可以在所需的 1,3-关系中建立拥挤的四元中心、烯基甲基和 C 环上的氧代取代基。通过切换到 1,4-萘醌亲二烯体,敏感底物的环加成反应在中等温度下以几乎定量的产率成功。