Abstract: | The absolute stereochemistry of bruceines D, E and H has been confirmed to be 1S, 5S, 7R, 8R, 9R, 10S, 11R, 12S, 13R, 14R, 15R and additionally 2S for bruceine E by a combination of 2D nmr [1H-1H and 1H-13C (one-bond and long-range) COSY] nOe and cd spectroscopic analyses. |