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Absolute Configuration of a Diterpene Lactone from Parinari capensis

✍ Scribed by Eliane Garo; Marc Maillard; Kurt Hostettmann; Helen Stdeckti-Evans; Steven Mavi

Publisher
John Wiley and Sons
Year
1997
Tongue
German
Weight
438 KB
Volume
80
Category
Article
ISSN
0018-019X

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✦ Synopsis

3C-NMR: 87.2 ppm) indicated that 1 was a modified kaurenoid with the Me group at C(10) shifted to C(9) . It was, therefore, identified as the 10-hydroxy-13-methoxy-9methyl-1 5-oxo-20-norkaur-16-en-18-0ic acid y-lactone. Further 2D-NMR experiments (COSY, HMBC and HMQC) allowed us the full assignment of the C-atoms (Table ). Crystals obtained from hexane/AcOEt were subjected to X-ray analysis (Fig. ) . The structure of 1 was thus confirmed and relative configurations at C(4), C(5), C(8), C(9), C(lO), and C(13) were determined.

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