Organic Letters 2001-Dec
The first naturally occurring Tie2 kinase inhibitor.
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[structure: see text] Bioassay-guided fractionation of the plant Acacia aulacocarpa, guided by a bioassay for Tie2 tyrosine kinase activity, yielded the novel triterpene 3,21-dioxo-olean-18-en-oic acid (1) as the first naturally occurring non-protein inhibitor of Tie2 kinase. The structure of 1 was assigned by analysis of spectral data. In addition to its activity as an inhibitor of Tie2 kinase, compound 1 also shows modest activity against a variety of cultured mammalian cells.
