Enantioselective Conversion of Oligoprenol Derivatives to Macrocycles in the Germacrene, Cembrene, and 18-Membered Cyclic Sesterterpene Series
作者:D. Srinivas Reddy、E. J. Corey
DOI:10.1021/jacs.8b10522
日期:2018.12.12
enantio-and diastereoselective process has been developed for the efficient conversion of farnesol and other oligoprenyl alcohols to chiral 10-, 14-, and 18-membered cyclization products, including germacrenol, (+)-costunolide, 3-β-elemol, and epi-mukulol. The key cyclization reaction utilizes ω-bromo aldehyde substrates, a chiral ligand, and indium powder as the reagent at -78 °C and generates 10-, 14-, and
开发了一种新的对映选择性和非对映选择性工艺,用于将法呢醇和其他低聚异戊二烯醇有效转化为手性 10-、14-和 18-元环化产物,包括锗烯醇、(+)-木香内酯、3-β-elemol、和epi-mukulol。关键环化反应利用 ω-溴醛底物、手性配体和铟粉作为试剂在 -78 °C 下生成 10-、14-和 18-元环状产物,产率 70-74%,产率为 94-95 % ee。