## Abstract The Et~2~O‐soluble fraction from the bark of __Magnolia kobus__ led to the isolation of two new lignans, (+)‐(7__α__,7′__α__,8__α__,8′__α__)‐3′,4,4′,5,5′‐pentamethoxy‐7,9′: 7′,9‐diepoxylignan‐3‐ol (**1**) and (+)‐(7__α__,7′__α__,8__α__,8′__α__)‐4,5‐dimethoxy‐3′,4′‐(methylenedioxy)‐7,9′:
Lignans from the bark extract of Pinus sylvestris L.
✍ Scribed by Jari Sinkkonen; Maarit Karonen; Jaana Liimatainen; Kalevi Pihlaja
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 119 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1780
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✦ Synopsis
Abstract
Three lignans were isolated from a bioactive fraction of the 70% aqueous acetone extract of the pine (Pinus sylvestris L.) bark. Their structures were identified by high‐resolution positive ion EI mass spectrometry and NMR spectroscopy. The complete assignment of proton and carbon signals was achieved by 2D NMR experiments: HSQC, HMBC, DQF‐COSY and NOESY. Copyright © 2006 John Wiley & Sons, Ltd.
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## Abstract A new dimeric lignan, named biplanispine A (**1**) which represents the first example of a dimeric 2,6‐diaryl‐3,7‐dioxabicyclo[3.3.0]octane skeleton from a __Rutaceae__ plant, together with 13 known lignans **2**–**14**, was isolated from the bark of __Zanthoxylum planispinum.__ Their s
needles (1 from less than 0.1 to about 0.9 pmol per g fresh weight, and 2 from 0.8 to 2.4 pmol per g fresh weight).I6] Figure 1 shows a typical HPLC elution profile of a methanolic extract from cotyledons after four days of UV-B treatment. Compounds 1 and 2 were purified and isolated by countercurr