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New eudesmane sesquiterpenes from Plectranthus cylindraceus
K Y Orabi1, J S Mossa, I Muhammed
1Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia. kyorabi@ksu.edu.sa
Journal of Natural Products
|January 5, 2001
Abstract:
Three new eudesmane sesquiterpenes, plectranthone (1), desacetylplectranthone (2), isodeacetylplectranthone (3), and the three known flavonols pachypodol, casticin, and chrysosplenol D were isolated for the first time from the aerial parts of Plectranthus cylindraceus. Their structures have been established on the basis of spectral data. The structures and relative stereochemistries of 1 and 2 were confirmed by single-crystal X-ray analysis.