Unexpected Novel Pheophytin Peroxides from the Leaves of Biden pilosa
✍ Scribed by Tzong-Huei Lee; Chung-Kuang Lu; Yueh-Hsiung Kuo; Jir-Mehng Lo; Ching-Kuo Lee
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- German
- Weight
- 163 KB
- Volume
- 91
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Two new pheophytins, bidenphytins A (1) and B (2), with peroxide functionalities on ring E, were isolated from Biden pilosa Linn. var. radiata Sch. Bip., a popular Taiwanese folk medicine. Also isolated were the following six known compounds: pheophytin a (3), (13^2^R)‐13^2^‐hydroxypheophytin a (4), (13^2^S)‐13^2^‐hydroxypheophytin a (5), (13^2^R)‐13^2^‐hydroxypheophytin b (6), (13^2^S)‐13^2^‐hydroxypheophytin b (7), and aristophyll‐C (8). Their structures were elucidated by spectroscopic methods (UV, IR, 1D‐ and 2D‐NMR) and by mass spectrometry (HR‐FAB‐MS). Possible biosynthetic pathways for 1 and 2 are proposed.