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Structure elucidation and NMR assignments of two new triterpenoids from the stems of Paragonia pyramidata (Bignoniaceae)

✍ Scribed by Xiao-Ling Wang; Anne-Emmanuelle Hay; An Matheeussen; Mahabir P. Gupta; Kurt Hostettmann

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
141 KB
Volume
49
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Phytochemical investigation of dichloromethane (DCM) extract from the stems of Paragonia pyramidata var. pyramidata L. Rich. (Bur.) resulted in the isolation and characterization of two new triterpenoids 3β,19β‐dihydroxylup‐12, 20(29)‐diene‐28‐oic acid (1) and 3β,19β‐dihydroxylup‐12‐en‐28‐oic acid (2), three known triterpenoids lupeol (3), spinosic acid A (4) and oleanolic acid (5), together with four known steroids (20R)‐22E‐24‐ethylcholesta‐4,22‐dien‐3‐one (6), (20R)‐24‐ethylcholest‐4‐en‐3‐one (7), stigmasterol (8) and β‐sitosterol (9). HREIMS, GC–MS and NMR experiments including HSQC, HMBC, COSY and NOESY were used for the determination of the structures and NMR spectral assignments. This is the first report about the chemical constituents for this plant. Copyright © 2011 John Wiley & Sons, Ltd.

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