Highly stereoselective total synthesis of methynolide, the aglycon of the 12-membered macrolide antibiotic methymycin. I. Synthesis of a prelog-djerassi lactone-type chiral intermediate from D-glucose.
作者:YUJI OIKAWA、TATSUYOSHI TANAKA、KIYOSHI HORITA、ICHIO NODA、NORIYUKI NAKAJIMA、NAOKI KAKUSAWA、TATSUO HAMADA、OSAMU YONEMITSU
DOI:10.1248/cpb.35.2184
日期:——
For the highly stereoselective synthesis of methynolide (2), the aglycon of the 12-membered macrolide antibiotic methymycin (1), a Prelog-Djerassi lactone-type chiral intermediate (7a) bearing four chiral centers corresponding to the C-2, C-3, C-4, and C-6 positions was synthesized from D-glucose. In this synthesis, several stereocontrolled reactions such as hydroboration, catalytic hydrogenation, etc. were successfully applied. The utility of the 4-methoxybenzyl protecting group was also demonstrated.
为了高度立体选择性地合成 12 元大环内酯抗生素甲基霉素(1)的苷元--甲基炔内酯(2),我们从 D-葡萄糖合成了一种 Prelog-Djerassi 内酯型手性中间体(7a),该中间体具有四个手性中心,分别对应于 C-2、C-3、C-4 和 C-6 位。在这一合成过程中,成功地应用了几种立体控制反应,如氢硼化、催化氢化等。此外,还证明了 4-甲氧基苄基保护基的作用。