Synthesis of brassinolide and its biosynthetic precursors using methyl 3-hydroxy-2-methylpropionate
作者:V. A. Khripach、V. N. Zhabinskii、K. V. Parkhimovich、O. V. Gulyakevich
DOI:10.1134/s1068162009020137
日期:2009.3
Formal synthesis of plant hormones that belong to the group of 24α-methylbrassinosteroids, including brassinolide and its biosynthetic precursors with one hydroxyl group in their side chain, was performed. Stereochemistry of a methyl group at the C24 atom was provided by the choice of the desired enanthiomer of methyl-3-hydroxy-2-methylpropionate and by the sequence of its conversions into the chiral
进行了属于 24α-甲基油菜素类固醇组的植物激素的正式合成,包括油菜素内酯及其侧链具有一个羟基的生物合成前体。C24 原子上甲基的立体化学是通过选择所需的甲基-3-羟基-2-甲基丙酸酯对映异构体及其转化为形成 C23-C28 所必需的手性中间体的顺序来提供的。侧链的片段。(22R,23R)-二醇基团是通过中间体 Δ22-类固醇的 Sharpless 不对称二羟基化引入的,这是低分子砜与类固醇 C22-醛的连接、乙酰化和还原脱硫的连续反应的产物中间体 β-乙酰氧基砜。22-乙酰氧基-23的还原,