- Enantioselective accumulation of (-)-pinoresinol through O- demethylation of (±)-eudesmin by Aspergillus niger
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Microbial transformation of (±)-eudesmin by Aspergillus niger was investigated. Enantioselective accumulation of (-)-pinoresinol was shown through O-demethylation of (±)-eudesmin. This fungus O-demethylated both enantiomers of eudesmin, but the conversion
- Kasahara, Hiroyuki,Miyazawa, Mitsuo,Kameoka, Hiromu
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p. 1479 - 1482
(2007/10/03)
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- SERRULATANE DITERPENES FROM EREMOPHILA SPP.
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Nine new serrulatane diterpenes have been isolated from various Eremophila species.Chemical and spectroscopic evidence for their structure is presented. Key Word Index - Eremophila spp.; Myoporaceae; serrulatane diterpenes.
- Forster, Peter G.,Ghisalberti, Emilio L.,Jefferies, Phillip R.,Poletti, Virginia M.,Whiteside, Nola J.
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p. 1377 - 1384
(2007/10/02)
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- Effects of O-Methylation and O-Glucosylation on Carbon-13 Nuclear Magnetic Resonance Chemical Shifts of Matairesinol, (+)-Pinoresinol and (+)-Epipinoresinol
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The effects of O-methylation and O-glucosylation on the carbon-13 nuclear magnetic resonance chemical shifts of matairesinol (1), (+)-pinoresinol (6) and (+)-epipinoresinol (11) are discussed.The chemical shifts of carbons on the 2,3-dibenzylated butyrolactone and 2,6-diarylated 3,7-dioxabicyclooctane rings are not affected by methylation and glucosylation of hydroxy groups on the aromatic rings.As regards the chemical shifts of aromatic carbons caused by O-methylation, all the 1'(1''),3'(3''), and 4'(4'') carbons of the guaiacyl unit are characteristically shifted downfield by 1.6+/-0.1, 1.3+/-0.1, and 2.4+/-0.1 ppm, respectively, while the 5'(5'') carbons are shifted upfield by 3.5+/-0.1 ppm.In the case of the chemical shifts of aromatic carbons caused by O-glucosylation, all the 1'(1'')and 3'(3'') carbons of the guaiacyl unit are characteristically shifted downfield by 3.0+/-0.1 and 1.3+/-0.1 ppm, respectively.Keywords - 13C-NMR; O-methylation shift; O-glucosylation shift; ligan; matairesinol; (+)-pinoresinol; (+)-epipinoresinol; guaiacyl group
- Nishibe, Sansei,Tsukamoto, Hiroki,Hisada, Sueo
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p. 4653 - 4657
(2007/10/02)
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