The structure and stereochemistry of diterpenes from trachylobium verrucosum Oliv.—V
作者:G. Hugel、A.C. Oehlschlager、G. Ourisson
DOI:10.1016/s0040-4020(01)82184-0
日期:1966.1
The isolation from Trachylobium verrucosum of seven new bicarbocyclic diterpenes, possessing the (−) labdane skeleton, is described. Their structure have been determined as 4d, 6d, 6e, 6f, 7a, 8a and 10b. In addition, caryophyllene oxide (9), enantio labd-8(20), 13-diene-15 oic acid (4g), enantio labd-8(20)-en-15,18-dioic acid (6c), enantio labd-8(20)-en-15-oic acid (5b) and (−) 13-epimanool (10a)
We report herein the synthesis of six diterpene derivatives, three of which are new, generated through known organic chemistry reactions that allowed structural modification of the existing natural products kaurenoic acid (1) and copalic acid (2). The new compounds were fully characterized using high resolution mass spectrometry, infrared spectroscopy, 1H- and 13C-NMR experiments. We also report the evaluation of the anti-tuberculosis potential for all compounds, which showed some promising results for Micobacterium tuberculosis inhibition. Moreover, the toxicity for each of the most active compounds was also assessed.