Search results for "RPE"
showing 10 items of 2566 documents
Sesquiterpene lactones of Anthemis alpestris
2002
Sesquiterpene lactones of two centaurea species from Sicily
1998
Jatrophane derivatives and a rearranged jatrophane from Euphorbia terracina
1998
Abstract The aerial parts of Euphorbia terracina yielded 11 new jatrophane derivatives as well as a further diterpene displaying the novel 1(15 → 14) abeo -jatrophane framework.
Photoinduced functionalization of the C-20 methyl group of the nor-diterpene atractyligenin
2001
Abstract Irradiation of the nor-diterpene atractyligenin at λ =254 nm in methanol gave, on one hand, the decarboxylation product, and provided, on the other hand, the transformation of the C-20 angular methyl into a methylene-carbomethoxy group. A photochemical pathway involving formation of C-19/C-20 bond is suggested.
Oxygenated nerolidol esters and eudesmane acids fromInula viscosa
1991
Abstract The aerial parts of Inula viscosa yielded three new esters of 9-hydroxynerolidol and two new eudesmane acids, along with several known compounds.
Aromatic abietane diterpenoids: total syntheses and synthetic studies
2015
Synthesis of (+)-podocarp-8(14)-en-13-one and methyl-(+)-13-oxo-podocarp-8(14)-en-18-oate from abietic acid
1985
Abstract An efficient method for the preparation of (+)-podocarp-8(14)-en-13-one 6 and methyl-(+)-13-oxo-podocarp-8(14)-en-18-oate 8 from abietic acid is described.
Four new eremophilendiolides from Ligularia atroviolacea
2007
From Ligularia atroviolacea, four new eremophilendiolides, 8 beta-hydroxy-eremophil-3,7 (11)-dien-12,8 alpha(14,6 alpha)-diolide (1), 8 beta-methoxy-eremophil-3,7(11)-dien-12,8 alpha(14,6 alpha)-diolide (2), 8 alpha-hydroxy-eremophil-3,7(11)-dien-12,8 beta(14,6 alpha)-diolide (3) and eremophil-3,7(11),8-trien-12,8 (14,6 alpha)-diolide (4), as well as a known diolide (5) were isolated. Their structures were elucidated on the basis of 1D and 2D NMR as well as ESI-MS spectral data. (c) 2006 Yu Zhao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Total syntheses of (+)-temisin, (+)-melitensin and related elemanolides from (-)-artemisin
1984
Abstract (+)-Temisin, (+)-melitensin, and related sesquiterpene lactones have been synthesized from (-)-artemisin.
Eudesmane and elemane derivatives from Onopordon acaulon
1993
Abstract From the methanol extract of Onopordon acaulon 11 sesquiterpenes were isolated. Two elemane and three eudesmane derivatives are described for the first time.