Bis-spirolabdane diterpenoids from Leonotis nepetaefolia.

  title={Bis-spirolabdane diterpenoids from Leonotis nepetaefolia.},
  author={Jun Li and Frank R Fronczek and Daneel Ferreira and Charles L. Burandt and Vincent Setola and Bryan L. Roth and Jordan Kordian Zjawiony},
  journal={Journal of natural products},
  volume={75 4},
Ten new bis-spirolabdane diterpenoids, leonepetaefolins A-E (1, 3, 5, 7, 9) and 15-epi-leonepetaefolins A-E (2, 4, 6, 8, 10), together with eight known labdane diterpenoids (11-18) as well as two known flavonoids, apigenin and cirsiliol, were isolated from the leaves of Leonotis nepetaefolia. The structures of the new compounds were determined on the basis of 1D- and 2D-NMR experiments including (1)H, (13)C, DEPT, (1)H-(1)H COSY, HSQC, HMBC, and NOESY. The absolute configuration of an epimeric… CONTINUE READING


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