Myrobotinol (1) was isolated from the leaves of Myrioneuron nutans (Rubiaceae) and its structure determined from spectral data, including mass spectrometry and 2D NMR. This compound presents a new hexacyclic alkaloid skeleton including a 1,3-oxazine and aminal functionality. The absolute configuration of myrobotinol was established by using Mosher's method. A plausible biosynthetic pathway starting from L-lysine via Delta-piperideine was proposed for this hexacyclic alkaloid.
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Pham et al. (2007) studied this question.
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