compounds for the first time. The key steps included a recently described homologation of benzoic acid to the analogous phenyl acetate using Birch reductive alkylation conditions, acylation of the appropriate phenyl acetate derivative, and a selective reduction and spontaneous biomimetic lactonization to yield the 3-isochromanone skeleton. The synthesized natural products were evaluated for their biological
报道了真菌代谢产物细胞孢子A,(±)-C和N的合成。并首次描述了细胞孢子J和K的合成。含有稀有的3-异苯并二氢
吡喃酮亚结构的
天然产物外消旋细胞孢子J和外消旋细胞孢子K的制备分别以8个线性步骤进行,总产率分别为45%和7个线性步骤,产率为46%,从而完成了表征这些化合物是第一次。关键步骤包括最近描述的使用桦木还原烷基化条件将
苯甲酸同化为
乙酸苯酯的类似物,适当
乙酸苯酯衍
生物的酰化,以及选择性还原和自发仿生内酯化以生成3-isochromanone骨架。