starting from three readily available fragments over 12 steps in 29.1% overall yield without using any transition metal catalysis. The key feature of this approach is a tandem intramolecular Diels–Alder cycloaddition to complete the hexacyclic framework with the correct stereochemistry and all the requisite structural elements in place to achieve the total synthesis of aflavinine and its congeners.
从三个容易获得的片段开始,经过12个步骤,以总收率29.1%的总收率(不使用任何过渡
金属催化),开发了一种便捷的途径,可从三个易于获得的片段中提取
黄酮素。该方法的关键特征是串联分子内Diels–Alder环加成反应,以正确的立体
化学和所有必要的结构要素完成六环骨架,以实现
黄酮素及其同类物的全合成。