Abstract Along with known flavonoid aglycones, the frond exudate of N. greggii yielded two ocotillol-type dammarane triterpenoids, whose structure was established by chemical reactions, spectral data and X-ray analysis.
摘要 与已知的黄酮苷元一起,N. greggii 的叶状分泌物产生了两种 ocotillol 型达马烷三萜类化合物,其结构是通过化学反应、光谱数据和 X 射线分析确定的。
Synthesis and biological evaluation of novel ocotillol-type triterpenoid derivatives as antibacterial agents
A novel class of ocotillol-type triterpenoid derivatives have been synthesized and evaluated for their in vitro antibacterial activity against several representative pathogenic bacterial strains. Compounds 20(S)-protopanaxadiol (PPD), 3, 5,16 and 24 exhibited potent antibacterial activity against Gram-positive bacteria. Compounds 3 and 5 also displayed promising antibacterial activity against a community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA; strain USA300). Furthermore, compounds PPD, 3 and 16 combined with two commercially available antibiotics kanamycin and chloramphenicol showed strong synergistic inhibitory effects at their sub-MIC concentrations against S. aureus USA300 and Bacillus subtilis 168. Additionally, cytotoxic activity assay showed that the compounds tested did not affect cell viability of the human epithelial kidney (HEK-293) and human cervical (HeLa) cells at their MICs. (C) 2013 Elsevier Masson SAS. All rights reserved.