Synthesen in der Isocamphanreihe, 38. Mitt.: Ozonolyse von 2-Acetyl-3,3-dimethylnorborn-5-en und Synthese eines neuen, tricyclischen Ketals mit patchouliartigem Geruch
作者:G. Buchbauer、H. Spreitzer、A. Gruber、C. Lux、A. Wolfsberger、H. Kalchauser
DOI:10.1007/bf00811319
日期:1994.3
The ozonolysis of endo-2-acetyl-3,3-dimethylbicyclo[2.2.1]hept-5-ene (endo-1) and its exo-epimer(exo-1) is described. The reaction products, after reductive work up as well as after oxidative work up, are characterized. The first procedure furnished the corresponding cyclopentane derivatives in good yield, namely 1,1-dimethyl-2-(1-hydroxyethyl)-3,5-bis-hydroxymethyl cyclopentane (2) as a cristalline compound from endo-1, the epimeric 10 as an oil from exo-1. The oxidative work up furnished in both cases via keto-enol-tautomerism the same acid, 4-acetyl-5,5-dimethyl-1,3-cyclopentane dicarboxylic acid, characterized as its methyl ester. Selective oxidation of the secondary hydroxyl group in 2 lead to the novel, tricyclic, even acid stable ketal 17, with very interesting olfactory properties.