Reactivity of alicyclic 1,5,9-triketones toward five-, six-, and seven-membered rings in acidic medium. Stereochemistry of intramolecular cyclization products
作者:Taisia I. Akimova、Olga A. Soldatkina、Andrey V. Gerasimenko、Vyacheslav G. Savchenko、Alevtina A. Kapustina
DOI:10.1007/s10593-021-03028-9
日期:2021.11
Among nine alicyclic 1,5,9-triketones with differently fused 5-, 6-, and 7-membered rings in the molecule, existing as mixtures of 3–6 diastereomers, only those containing at least two 6-membered rings were capable of intramolecular cyclization in acidic medium (HCl, EtOH). The diastereomer mixture underwent stereoselective transformation, giving one major cyclization product. The relative configuration
在分子中具有不同稠合的 5、6 和 7 元环的 9 种脂环族 1,5,9-三酮中,以 3-6 种非对映异构体的混合物形式存在,只有那些含有至少两个 6 元环的才能在酸性介质(HCl、EtOH)中进行分子内环化。非对映异构体混合物进行立体选择性转化,得到一种主要的环化产物。通过 X 射线晶体学比较在酸性或碱性条件下获得的环化产物中手性中心的相对构型。这些差异是由环化第一阶段不同的立体化学结果引起的。