A highly stereoselective synthesis of the seco-acid (3) of methynolide (1), the aglycon of the 12-membered macrolide methymycin was carried out, starting from D-glucose via the Wittig-Horner coupling of the two segments i (4) (C-9-C-13) and ii (5) (C-1-C-8), which were synthesized by the use of p-methoxybenzyl and p-methoxybenzylidene acetal protecting groups for hydroxy functions.
以
D-葡萄糖为起点,通过 i (4) (C-9-C-13) 和 ii (5) (C-1-C-8)两个区段的 Wittig-Horner 偶联,对甲氧基苄基和对甲氧基亚苄基
乙缩醛保护基团的羟基官能团合成了甲
炔诺酮 (1) 的仲酸 (3),这是 12 元大环内酯甲
炔诺酮的缩合物,从而实现了甲
炔诺酮 (1) 仲酸 (3) 的高度立体选择性合成。