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11 α ‐Ethoxy‐ β ‐boswellic Acid and Nizwanone, a New Boswellic Acid Derivative and a New Triterpene, Respectively, from Boswellia sacra
Author(s) -
AlHarrasi Ahmed,
Ali Liaqat,
Ur Rehman Najeeb,
Hussain Javid,
Hussain Hidayat,
AlRawahi Ahmed,
Shamim Rizvi Tania
Publication year - 2013
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.201200231
Subject(s) - triterpene , chemistry , stereochemistry , two dimensional nuclear magnetic resonance spectroscopy , derivative (finance) , alkoxy group , organic chemistry , medicine , alternative medicine , pathology , financial economics , economics , alkyl
A new boswellic acid derivative, 11 α ‐ethoxy‐ β ‐boswellic acid (EBA; 1 ) and a new ursane‐type triterpene, named nizwanone ( 2 ), were isolated from Omani frankincense Boswellia sacra Flueck . together with two known compounds papyriogenin B and rigidenol. The structures of 1 and 2 were elucidated by detailed spectroscopic analysis using 1 H‐ and 13 C‐NMR, 1 H, 1 H‐COSY, HMQC, HMBC, and HR‐EI‐MS techniques. The relative configurations of 1 and 2 were assigned by comparative analysis of the NMR spectral data with those of known analogs together with NOESY experiments. Structures of known compounds were identified by comparison with the reported data.