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Abstract
Two new ursane-type triterpenes characterized as 3-oxo-24-acetoxy-11α-hydroxy-urs-12-ene (1) and methyl 3α-acetoxy-11α-methoxy-urs-12-en-24-oate (2), together with known compounds 3–11, were isolated from Boswellia rivae oleo-gum resin exudate. Their structural elucidation was accomplished using physical, chemical, and spectroscopic methods. The compounds exhibited weak to moderate antibacterial activities against some Gram-positive and Gram-negative bacteria.
Acknowledgments
The authors are thankful to Mr. Gachathi and Ms. Rose Chiteva of Non-Wood Forest Products program, Kenya Forestry Research Institute for identification and collection the plant materials. The Institute of Organic Chemistry, Technical University of Munich, Germany is acknowledged for the spectroscopic data.