First Total Synthesis of the Benzotropolone/Bis(pulvinone) Natural Product Aurantricholone Exploiting New Strategies for Establishing Benzotropolones and
<i>Z</i>
‐Configured Pulvinones
作者:Philip Koblischek、Reinhard Brückner
DOI:10.1002/ejoc.202201120
日期:2023.2.17
fungal colorant aurantricholone was synthesized in 15 steps. Its benzotropolone core resulted from 5-bromo-7,8-dimethoxytetral-1-one in 3 steps which included a 1-pot ring-enlargement/oxidation/acetylation sequence. A regioselective 2-step bromination allowed two Z-selective Suzuki couplings with a new tetronate building block to ensue in one go. Deprotection (2 steps) gave protonated aurantricholone or
真菌着色剂 aurantricholone 分 15 步合成。其苯并托酚酮核心由 5-bromo-7,8-dimethoxytetral-1-one 在 3 个步骤中产生,其中包括 1-pot 扩环/氧化/乙酰化序列。区域选择性两步溴化允许两个Z选择性 Suzuki 偶联与一个新的 tetronate 结构单元一起完成。脱保护(2 步)得到质子化的橙黄酚或其 Li 或 Ca 盐。