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Unexpected Novel Pheophytin Peroxides from the Leaves of Biden pilosa
Author(s) -
Lee TzongHuei,
Lu ChungKuang,
Kuo YuehHsiung,
Lo JirMehng,
Lee ChingKuo
Publication year - 2008
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200890016
Subject(s) - chemistry , pheophytin , stereochemistry , mass spectrometry , two dimensional nuclear magnetic resonance spectroscopy , ring (chemistry) , peroxide , organic chemistry , biochemistry , chromatography , photosynthesis , photosystem ii
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.