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Biologically active natural products can be regarded as evolutionary selected and biologically validated starting points in structural space for the development of compound libraries. For libraries designed and synthesized around a given natural product, a higher hit rate and the identification of biologically relevant hits can be expected, justifying a… (More)
Annonin I ( 1) and anonin VI ( 9) were isolated from the seeds of ANNONA SQUAMOSA L. (Annonaceae). The constitution of 1 is identical with that of squamocin, isolated by Fujimoto et al. (8). The relative configuration of 1 was elucidated by X-ray diffraction analysis of a derivative. The constitution and relative configuration of 9 was established by (13)C-… (More)
Annonacin ( 1), annonacin A ( 6), and annonastatin ( 7) were isolated from the seeds of ANNONA SQUAMOSA L. (Annonaceae). Compounds 6 and 7 are described for the first time. The relative configuration of the tetrahydrofuran core of 1 (with hitherto unknown configuration), as well as those of compounds 6, and 7 were established by (13)C- and (1)H-NMR… (More)
The relative stereochemistries of bullatalicin  and bullatalicinone  were partially reassigned based on COSY and relayed COSY spectra. The structures of annonins VIII , IV , and XVI  were revised and concluded as bullatalicin , bullatanocin , and squamostatin A , respectively.