overall yield from O-methylnaphthazarin. Highlights of the synthetic work include an Ullmann coupling and a possibly biomimetic oxidative spirocyclization for the introduction of the naphthalene ketal as well as the use of a retro-Diels-Alder reaction to unmask the reactive enone moiety in the naphthoquinone bisepoxide ring system. A novel highly bulky chiral binaphthol ligand was developed for a boron-mediated
高度氧化的抗真菌抗癌
天然产物(+/-)-二恶英σ是通过10个步骤制备的,总产率为15%,来自O-
甲基萘他林。合成工作的重点包括用于引入
萘基
缩酮的Ullmann偶联和可能的仿生氧化螺环化,以及使用Retro-Diels-Alder反应来掩盖
萘醌双
环氧化物环系统中的反应性烯酮部分。开发了一种新型的高体积手性联
萘酚配体,用于
硼介导的Diels-Alder反应,该反应构成了(+)-二恶英毒素形式的正式不对称总合成。