Reactivity of alicyclic 1,5,9-triketones toward five-, six-, and seven-membered rings in acidic medium. Stereochemistry of intramolecular cyclization products

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作者
Taisia I. Akimova
Olga A. Soldatkina
Andrey V. Gerasimenko
Vyacheslav G. Savchenko
Alevtina A. Kapustina
机构
[1] School of Natural Sciences,
[2] Far Eastern Federal University,undefined
[3] Institute of Chemistry,undefined
[4] Far East Branch of the Russian Academy of Sciences,undefined
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alicyclic 1,5,9-triketones; diastereomers; hemiacetals; diastereoselectivity; intramolecular cyclization;
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摘要
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 of chiral centers in cyclization products obtained under acidic or basic conditions was compared by X-ray crystallography. The differences were caused by divergent stereochemical outcome at the first stage of cyclization.
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页码:1079 / 1085
页数:6
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