Unexpected Novel Pheophytin Peroxides from the Leaves of Biden pilosa

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), (132R)‐132‐hydroxypheophytin a (4), (13...

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Bibliographic Details
Published in:Helvetica chimica acta 2008-01, Vol.91 (1), p.79-84
Main Authors: Lee, Tzong-Huei, Lu, Chung-Kuang, Kuo, Yueh-Hsiung, Lo, Jir-Mehng, Lee, Ching-Kuo
Format: Article
Language:English
Subjects:
Biden pilosa
Bidenphytins A and B
Pheophytin peroxides
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Summary: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), (132R)‐132‐hydroxypheophytin a (4), (132S)‐132‐hydroxypheophytin a (5), (132R)‐132‐hydroxypheophytin b (6), (132S)‐132‐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.
ISSN:0018-019X
1522-2675
DOI:10.1002/hlca.200890016