Results 161 to 170 of about 20,581 (189)

A New Kaurane Diterpene from the Seeds of Vernonia anthelmintica

Chemistry of Natural Compounds, 2018
A new kaurane diterpene, 16α,17-acetonide-3α-hydroxykauran (1), and four known octadecenoic acid derivatives,12,13,17-trihydroxy-9(Z)-octadecenoic acid methyl ester (2), 12,13,17-trihydroxy-9(Z)-octadecenoic acid (3), tianshic acid (4), and 1,3-divernolin (5), were isolated from the seeds of Vernonia anthelmintica.
A. Turak, Z. Maimaiti, H. A. Aisa
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Nor-ent-kaurane diterpenes and hydroxylactones from Antennaria geyeri and Anaphalis margaritacea

Phytochemistry, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Ahmed A, Ahmed, Taha A, Hussein, Ahmed A, Mahmoud, Mohamed A, Farag, Paul W, Paré, Małgorzata, Wojcińska, Joe, Karchesy, Tom J, Mabry   +7 more
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Kaurane-Type Diterpene Glycoside from the Stem Bark ofAcanthopanax trifoliatus

Planta Medica, 2004
A new diterpene glycoside, acantrifoside D ( 1), as well as three known diterpenes (2 - 4) were isolated from the stem bark of Acanthopanax trifoliatus from Vietnam. Based on 1D and 2D NMR spectroscopic data, their chemical structures were determined to be 16alpha,17-dihydroxy- ent-kauran-19-oic acid 16- O-beta- D-glucopyranoside 19- O-beta- D ...
Phan Van, Kiem, Xing Fu, Cai, Chau Van, Minh, Jung Joon, Lee, Young Ho, Kim   +4 more
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Bitter kaurane-type diterpene glucosides from the liverwort Jungermannia infusca

Phytochemistry, 1990
Abstract Five new kaurene-type bitter diterpene glucosides, infuscasides AE, have been isolated from the liverwort Jungermannia infusca together with the previously known ent-15α-hydroxykaurene and stigmasteryl glucoside and their structures elucidated by chemical data and the extensive 2D-COSY NMR spectroscopy.
Fumihiro Nagashima, Masao Toyota, Yoshinori Asakawa   +2 more
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Complete1H and13C NMR assignment of a kaurane diterpene fromPiliostigma thonningii

Magnetic Resonance in Chemistry, 1997
The diterpene ent-16α-hydroxykauran-18-oic acid was isolated from the leaves of Piliostigma thonningii. Structural elucidation and complete 1H and 13C NMR chemical shift assignments of this compound were achieved by 2D experiments. © 1997 John Wiley & Sons, Ltd.
M.-T. Martin, M. Païs, A. O. Ogundaini, J. C. Ibewuilke, F. O. Ogungbamila   +4 more
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Structure of Kaurane-Type Diterpenes fromParinari spruceiand their Potential Anticancer Activity

Planta Medica, 2004
Twenty-three kaurane-type diterpenes 1 - 23, including twenty new natural products 1 - 20, have been isolated from the leaves of Parinari sprucei and their structures elucidated by spectroscopic and chemical analysis. The isolated compounds were tested for their cytotoxic activity towards a panel of cancer cell lines. Compounds 9 and 10 showed activity
BRACA, ALESSANDRA, ARMENISE A, MORELLI, IVANO, MENDEZ J, MI Q, CHAI HB, SWANSON SM, KINGHORN AD, DE TOMMASI N.   +8 more
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Tricalysiolides A–F, new rearranged ent-kaurane diterpenes from Tricalysia dubia

Tetrahedron, 2006
Abstract Six rearranged ent-kaurane diterpenes, tricalysiolides A–F, having the cafestol-type carbon framework were isolated from the wood of Tricalysia dubia (Rubiaceae). Their absolute structures were determined on the basis of the 2D NMR spectroscopy, X-ray crystallographic analysis, and chemical methods.
Koichi Nishimura, Yukio Hitotsuyanagi, Noriko Sugeta, Kei-ichi Sakakura, Kazuya Fujita, Haruhiko Fukaya, Yutaka Aoyagi, Tomoyo Hasuda, Takeshi Kinoshita, Dong-Hui He, Hideaki Otsuka, Yoshio Takeda, Koichi Takeya   +12 more
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Kaurane and kaurene diterpenes from the stem bark of Xylopia acutiflora

Phytochemistry, 1982
Abstract Four diterpenes were isolated from the stem bark of Xylopia acutiflora and characterized as (−)-kauran-16α-ol, 7,8-acetoxy-(−)-kaur-16-en-19-oic acid, 15-oxo-(−)-kaur-16-en-19-oic acid, and 16α- hydroxy-(−)-kauran-19-oic acid.
Choudhury M. Hasan, Terence M. Healey, Peter G. Waterman   +2 more
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Structural Studies of Kaurane Diterpenes From Ryparosa acuminata (Flacourtiaceae)

Australian Journal of Chemistry, 1993
Two new diterpenes have been isolated from the twigs of Ryparosa acuminata ( Flacourtiaceae ), and identified as 16a,19-dihydroxykauran-20-oic acid d- lactone and 16a-hydroxykaurane-19,20-dial. Friedelin and eudesmin were also isolated. The structure of the lactone was confirmed by X-ray crystallography.
K Shaari, AI Gray, DCR Hockless, PG Waterman, AH White   +4 more
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Recent developments in the syntheses of C-20-oxygenated ent-kaurane diterpenoids.

ChemPlusChem
En t-kaurane diterpenes are a large group of natural products, with more than 1,000 compounds since their discovery. Due to their excellent biological activities and complex polycyclic structures, these compounds have attracted organic synthesis chemists
Guizhou Yue, Bo Liu
semanticscholar   +1 more source