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Structural and spectral assignment by 2D NMR of a new prenylated benzopyrancarboxylic acid and structural reassignment of a related compound

✍ Scribed by Sharon J. Burke; Helen Jacobs; Stewart Mclean; William F. Reynolds

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
79 KB
Volume
41
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

A new prenylated benzopyrancarboxylic acid, 1a (3,4‐dihydro‐5‐hydroxy‐2,7‐dimethyl‐8‐(2‐methyl‐2‐butenyl)‐ 2‐(4‐methyl‐1, 3‐pentadienyl)‐2__H__‐1‐benzopyran‐6‐carboxylic acid) was isolated from Peperomia amplexicaulis and fully characterized by 1D and 2D NMR and high‐resolution mass spectrometry. In the course of this investigation, the structure of a related compound (minus the carboxylic acid group) which was previously assigned as 2b was corrected to structure 1b. Copyright © 2003 John Wiley & Sons, Ltd.

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