From Vetiver to Patchouli: Discovery of a NewHigh-Impact Spirocyclic Patchouli Odorant
作者:Philip Kraft、Walter Eichenberger、David Frech
DOI:10.1002/ejoc.200500085
日期:2005.8
a new, potent patchouli odorant was discovered. Its structure was elucidated as 1-hydroxy-1,4,7,7,9-pentamethylspiro[4.5]decan-2-one (15/16), and both diastereoisomers were synthesized from the previously reported 4,7,7,9-tetramethyl-1-methylenespiro[4.5]decan-2-one by epoxidation with m-chloroperoxybenzoic acid, reduction with lithium aluminum hydride, and subsequent oxidation with pyridinium chlorochromate
在合成新香根草气味剂的过程中,发现了一种新的、有效的广藿香气味剂。其结构被阐明为 1-羟基-1,4,7,7,9-pentamethylspiro[4.5]decan-2-one (15/16),两种非对映异构体均由先前报道的 4,7,7,9 -tetramethyl-1-methylenespiro[4.5]decan-2-one 通过用间氯过苯甲酸环氧化,用氢化铝锂还原,然后用氯铬酸吡啶鎓或 Dess-Martin periodinane 氧化。发现 1,4-不相似异构体 15 是气味最强烈的非对映异构体,其 0.067 ng/L 空气的优异气味阈值触发了衍生物 19、22、23 和 26 的合成,这些衍生物具有不同的甲基替代模式或环大小。Swern 氧化避免了氧化步骤中的乙二醇裂解。三个另外的 4-脱甲基衍生物,32、33 和 34,是通过短序列制备的,该序列由 Diels-Alder