- Iridoid and phenylpropanoid glucosides from Tecoma capensis
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Leaves of Tecoma capensis contain, together with tecomoside, large quantities of it's benzoic and cinnamic esters. A novel glucoside was isolated and, by spectroscopic and chemical data, characterized as 7-O-(p- methoxy) benzoyl tecomoside. Flowers of T.
- Guiso, Marcella,Marra, Carolina,Piccioni, Francesco,Nicoletti, Marcello
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- Synthesis of 13C-labeled possible intermediates in the biosynthesis of phenylethanoid derivatives, cornoside and rengyosides
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In order to clarify the biosynthetic pathway of C6-C2 unit compounds containing salidroside, cornoside, and rengyosides A and B in oleaceous plants, 13C-labeled putative precursors, 4-hydroxyphenylethanol, salidroside and cornoside, were prepared.
- Kuwajima, Hiroshi,Takai, Yoshitaka,Takaishi, Kiyokazu,Inoue, Kenichiro
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p. 581 - 586
(2007/10/03)
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- Chemoenzymatic synthesis of rengyoside-A, -B, isorengyoside and synthesis of their aglycones
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The chemoenzymatic synthesis of a group of naturally occurring cyclohexylethanoids, rengyoside-A, -B and isorengyoside, has been performed by enzymatic glucosidation of their chemically synthesized aglycones, rengyol, rengyoxide and isorengyol.
- Soriente, Annunziata,Della Rocca, Anna,Sodano, Guido,Trincone, Antonio
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p. 4693 - 4702
(2007/10/03)
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- BIOGENESIS-LIKE TRANSFORMATION OF SALIDROSIDE TO RENGYOL AND ITS RELATED CYCLOHEXYLETANOIDS OF FORSYTHIA SUSPENSA
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Photooxygenation of salidroside (8) in methanol in presence of Rose Bengal afforded cornoside (9), which, on high pressure hydrogenation with 5percent palladium on activated carbon, yielded rengyoside B (6).Reduction of 6 with sodium borohydride gave rengyoside A(5) stereoselectively.By enzymatic hydrolysis, 9, 6 and 5 furnished rengyolone (4), rengyoxide (3) and rengyol (1), respectively. Similerly, p-hydroxyphenylethanol (10), the aglycone part of salidroside (8), was oxygenated photochemically to a dienone alcohol, which cyclized spontaneously to rengyolone (4).Hallerone (17) was obtained by the photooxygenation of p-hydroxyphenylethyl acetate (10b).Thus the plausible biosynthetic routes from salidroside (8) to rengyol (1) and the related natural cyclohexylethanoids were simulated chemically.
- Endo, Katsuya,Seya, Kazuhiko,Hikino, Hiroshi
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p. 3673 - 3682
(2007/10/02)
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