Asymmetric Synthesis of Highly Enantiomerically Enriched (<i>S</i>)(-)-β-Bisabolene
作者:Laura Argenti、Fabio Bellina、Adriano Carpita、Renzo Rossi
DOI:10.1080/00397919508011421
日期:1995.10
Abstract (S)-β-Bisabolene, (S)-1, was synthetized by a synthetic route in which (S)-4-methyl-3-cyclohexene carboxylic acid, (S)-10, which was the key intermediate, was prepared via a highly diastereoselective TiCl4-catalyzed Diels-Alder reaction between isoprene and the acrylate of commercial (R)-pantolactone, followed by hydrolysis. Compound (S)-10 was then converted into ketone (S)-13 using two different
摘要 (S)-β-红没药烯 (S)-1 通过合成路线合成,其中 (S)-4-甲基-3-环己烯羧酸 (S)-10 是关键中间体,通过高度非对映选择性 TiCl4 催化异戊二烯与商业 (R)-泛内酯的丙烯酸酯之间的 Diels-Alder 反应制备,然后水解。然后使用两种不同的程序将化合物(S)-10转化为酮(S)-13。其中最好的一种,就立体特异性程度而言,涉及 (S)-10 与 2 当量的 4-methyl-3-penten-1-yllithium, 14 在 CeCl3 存在下的反应,并得到 (S )-13 有大约。84% EE。该酮的 Zr 促进的亚甲基化提供了高度对映体富集的 (S)-1。