Synthetic Studies of an 18-Membered Antitumor Macrolide, Tedanolide. 5. Stereoselective Synthesis of the C13-C23 Part via Condensation of Two Fragments, C13-C17 and C18-C21, by Taking Advantage of the 3,4-Dimethoxybenzyl Protecting Group.
作者:Bao-Zhong ZHENG、Hiroshi MAEDA、Michiko MORI、Shin-ichi KUSAKA、Osamu YONEMITSU、Tomohiro MATSUSHIMA、Noriyuki NAKAJIMA、Jun-ichi UENISHI
DOI:10.1248/cpb.47.1288
日期:——
An efficient and stereoselective synthesis of the C13-C23 part (8) was achieved starting from methyl (R)- and (S)-3-hydroxy-2-methylpropionates (9) via coupling of the C13-C17 aldehyde (6), prepared by Evans asymmetric aldol reaction, with the C18-C21 iodoalkene (5b) by taking advantage of the 3,4-dimethoxybenzyl protecting group.
由C13-C17醛(6)的偶联反应,从(R)-和(S)-3-羟基-2-甲基丙酸甲酯(9)开始,实现了C13-C23部分(8)的高效,立体选择性合成,通过利用3,4-二甲氧基苄基保护基,与C18-C21碘代烯烃(5b)通过Evans不对称醛醇缩合反应制备。