Intramolecular cyclization involving O-vinyl or O-vinylketoxime function in a number of pentacyclic triterpenoids in superbasic medium |
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| Authors: | A V Orlov N G Komissarova O V Shitikova L V Spirikhin M S Yunusov |
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| Institution: | 1. Institute of Organic Chemistry, Ufa Research Center of the Russian Academy of Sciences, 71 prosp. Oktyabrya, 450054, Ufa, Russian Federation
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| Abstract: | 28-Triphenylmethoxylup-20(29)-ene-2,3-dione dioxime and 18α(H)-oleanane-3β,19β,28-triol upon reaction with acetylene in superbasic medium KOH-DMSO undergo intramolecular cyclization with the formation of products containing 1,2,5-oxadiazole and tetrahydrofuran fragment, respectively. |
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