Detection of a “Nonaromatic” NIH Shift during In Vivo Metabolism of the Monoterpene Carvone in Humans
摘要:
High-resolution gas chromatography in combination with mass spectrometry and high-resolution mass spectrometry was used to determine the positions and extent of labeling in the metabolites of carvone, namely in alpha,4-dimethyl-5-oxo-3-cyclohexene-1-acetic acid (dihydrocarvonic acid), (alpha-methylene-4methyl-5-oxo-3-cyclohexene-1 -acetic acid (carvonic acid), and 5-(1,2-dihydroxy-l-methylethyl)-2methyl-2-cyclohexen-1 -one (uroterpenolone), after human ingestion of 9,9-dideutero- and 9-(13)-C-carvone. Carvonic acid was formed by oxidation at the methyl carbon of the isopropenyl group of carvone, whereas dihydrocarvonic acid was formed by oxidation at the methylene position, most probably via carvone epoxide. A "nonaromatic" NIH shift must occur during the subsequent reactions yielding dihydrocarvonic acid. Additionally, dehydrogenation of dihydrocarvonic acid and hydrogenation of carvonic acid were observed, resulting in minor amounts of both acids owning a carboxy group of opposite origin. Uroterpenolone was found to be exclusively formed by oxidation at the methylene carbon of the isopropenyl group of carvone, and thus, most probably by hydrolysis of carvone epoxide.
The stereoselective synthesis of the major oxygenated metabolites of trans-sobrerol (1) in optically active and/or racemic form is described.
描述了光学活性和/或外消旋形式的反式-sobrerol(1)的主要氧化代谢物的立体选择性合成。
In Vivo Studies on the Metabolism of the Monoterpenes <i>S</i>-(+)- and <i>R</i>-(−)-Carvone in Humans Using the Metabolism of Ingestion-Correlated Amounts (MICA) Approach
作者:Wolfgang Engel
DOI:10.1021/jf010157q
日期:2001.8.1
The major in vivo metabolites of S-(+)- and R-(-)-carvone in a metabolism of ingestion correlated amounts (MICA) experiment were newly identified as alpha,4-dimethyl-5-oxo-3-cyclohexene-1-acetic acid (dihydrocarvonic acid), alpha-methylene-4-methyl-5-oxo-3-cyclohexene-1-acetic acid (carvonic acid), and 5-(1,2-dihydroxy-1-methylethyl)-2-methyl-2-cyclohexen-1-one (uroterpenolone) on the basis of mass
Detection of a “Nonaromatic” NIH Shift during In Vivo Metabolism of the Monoterpene Carvone in Humans
作者:Wolfgang Engel
DOI:10.1021/jf011199h
日期:2002.3.1
High-resolution gas chromatography in combination with mass spectrometry and high-resolution mass spectrometry was used to determine the positions and extent of labeling in the metabolites of carvone, namely in alpha,4-dimethyl-5-oxo-3-cyclohexene-1-acetic acid (dihydrocarvonic acid), (alpha-methylene-4methyl-5-oxo-3-cyclohexene-1 -acetic acid (carvonic acid), and 5-(1,2-dihydroxy-l-methylethyl)-2methyl-2-cyclohexen-1 -one (uroterpenolone), after human ingestion of 9,9-dideutero- and 9-(13)-C-carvone. Carvonic acid was formed by oxidation at the methyl carbon of the isopropenyl group of carvone, whereas dihydrocarvonic acid was formed by oxidation at the methylene position, most probably via carvone epoxide. A "nonaromatic" NIH shift must occur during the subsequent reactions yielding dihydrocarvonic acid. Additionally, dehydrogenation of dihydrocarvonic acid and hydrogenation of carvonic acid were observed, resulting in minor amounts of both acids owning a carboxy group of opposite origin. Uroterpenolone was found to be exclusively formed by oxidation at the methylene carbon of the isopropenyl group of carvone, and thus, most probably by hydrolysis of carvone epoxide.