Neomethynolide (1), the aglycone of a twelve-membered ring macrolide, neomethymycin, was totally synthesized in its optically active form via 8,9-didehydro-1. The construction of the skeleton was carried out by condensing a stereoselectively synthesized fragment, 4-t-butyldimethylsiloxy-5-(2-methoxyethoxymethoxy)3-methyl-1-hexyne, with Prelog-Djerassi lactonic ester, and mixed anhydride method was used for the lactonization of an intermediary hydroxy acid. The full stereochemistry of 1 was established by this synthesis.
新甲基霉素(Neomethynolide)(1)是十二元环大环内酯新甲基霉素的苷元,通过 8,9-二脱氢-1 完全合成了其光学活性形式。骨架的构建是通过将立体选择性合成的片段 4-t-丁基二甲基
硅氧基-5-(2-甲氧基乙氧基甲氧基)
3-甲基-1-己炔与 Prelog-Djerassi
乳酸酯缩合,并使用混合酸酐法对中间羟基酸进行内酯化。通过这一合成,确立了 1 的完整立体
化学结构。