Abstract
Four novel 29-nor-3,4-seco-cycloartanes, (6S)-hydroxy-25-methoxy-29-nor-3,4-seco-cycloart-4(30),23-dien-3-oic acid methyl ester (1), (6S,25)-dihydroxy-29-nor-3,4-seco-cycloart-4(30),23-dien-3-oic acid methyl ester (2), (6S)-hydroxy-24-oxo-29-nor-3,4-seco-cycloart-4(30),25-dien-3-oic acid methyl ester (3), and (6S)-hydroxy-(24ξ)-hydroperoxy-29-nor-3,4-seco-cycloart-4(30),25-dien-3- oic acid methyl ester (4), along with a semi-synthetic acetylated derivative, (6S,24ξ)-diacetyloxy-29-nor-3,4-seco-cycloart-4(30),25-dien-3-oic acid methyl ester (5), were isolated and characterized from the aerial parts of Antirhea acutata (DC.) Urb. (Rubiaceae). Their structures and absolute stereochemistry were elucidated by spectroscopic and chemical methods. Compounds 1-5 are based on the unprecedented 29-nor-3,4-seco-cycloartane skeleton. Compound 4 showed moderate inhibitory activities in cyclooxygenase-1 and -2 assays (IC50 45.7 and 18.4 μM, respectively), while the other four isolates were inactive.
Original language | English |
---|---|
Pages (from-to) | 7107-7112 |
Number of pages | 6 |
Journal | Tetrahedron |
Volume | 57 |
Issue number | 33 |
DOIs | |
Publication status | Published - 2001 Aug 13 |
Externally published | Yes |
Bibliographical note
Funding Information:This work was supported by program project P01 CA48112 funded by the National Cancer Institute, NIH, Bethesda, MD. We thank Dr K. Fagerquist, Mass Spectrometry Facility, Department of Chemistry, University of Minnesota, Minneapolis, MN, for the mass spectral data. We are grateful to the Research Resources Center, University of Illinois at Chicago, for the provision of certain spectroscopic equipment used in this investigation.
Keywords
- 29-nor-3,4-seco-cycloartane
- Antirhea acutata
- Cyclooxygenase-1 and -2
- Rubiaceae
ASJC Scopus subject areas
- Biochemistry
- Drug Discovery
- Organic Chemistry