Herein, we present a new strategy for the preparation of a broad range of brassinosteroid biosynthetic precursors/metabolites differing by the ring A fragment. The protocol is based on the use of readily available phytohormones of this class bearing a 2α,3α-diol moiety (epibrassinolide or epicastasterone) as starting materials. The required functionalities (Δ2-, 2α,3α- and 2β,3β-epoxy-, 2α,3β-, 2β,3α-, and 2β,3β-dihydroxy-, 3-keto-, 3α- and 3β-hydroxy-, 2α-hydroxy-3-keto-) were synthesized from 2α,3α-diols in a few simple steps (Corey–Winter reaction, epoxidation, oxidation, hydride reduction, etc.).
在此,我们提出了一种新的策略,用于制备一系列不同环A片段的植物甾醇生物合成前体/代谢物。该方案基于使用易得的植物激素(具有2α,3α-二醇基团的表油菜素或表油脂酮)作为起始材料。所需的官能团(Δ2-,2α,3α-和2β,3β-环氧基,2α,3β-,2β,3α-和2β,3β-二羟基,3-酮基,3α-和3β-羟基,2α-羟基-3-酮基)可以从2α,3α-二醇中通过几个简单步骤合成(Corey-Winter反应,环氧化,氧化,氢化还原等)。