Highly stereoselective total synthesis of methynolide, the aglycon of the 12-membered macrolide antibiotic methymycin. II. Kinetic acetalization and synthesis of the seco-acid.
作者:YUJI OIKAWA、TATSUYOSHI TANAKA、TATSUO HAMADA、OSAMU YONEMITSU
DOI:10.1248/cpb.35.2196
日期:——
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。