作者:Sagar S. Thorat、Gamidi Rama Krishna、Ravindar Kontham
DOI:10.1021/acs.joc.1c01634
日期:2021.10.1
A full account of our efforts toward the stereoselective total synthesis of sesquiterpenoid-derived natural products (±)-pleurospiroketals A and B is described. Commercially available 3-methyl-2-cyclohexenone and 2,2-dimethyloxirane were used as key building blocks, and the substrate-controlled stereoselection was exploited to access the entire stereochemistry of these natural products. Initially,
描述了我们对倍半萜类衍生天然产物 (±)-pleurospiroketals A 和 B 的立体选择性全合成所做的努力。市售的 3-甲基-2-环己烯酮和 2,2-二甲基环氧乙烷被用作关键构建块,并利用底物控制的立体选择来获取这些天然产物的整个立体化学。最初,发现涉及 [6,5]-双环内酯中间体的计划合成路线是不可逾越的,后来的策略包括 OsO 4 -NMO 介导的 3-甲基-2-环己烯酮二羟基化,然后是 Luche 还原,Eschenmoser甲基化和 Brønsted 酸诱导的 spiroketalization 步骤,最终被确定为可靠的策略。