Revisiting Diterpene Lactones of Suregada multiflora.
โ Scribed by M. Iqbal Choudhary; Humaira Y. Gondal; Ahmed Abbaskhan; Ismat A. Jahan; Masood Parvez; Nilufar Nahar; Atta-ur-Rahman Atta-ur-Rahman
- Publisher
- John Wiley and Sons
- Year
- 2004
- Weight
- 20 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0931-7597
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๐ SIMILAR VOLUMES
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
The oxidation of a,@unsatumted ketones with pemcids is known to yield enol and/or epoxy esters or lactones depending on the reaction conditions and on whether the enone is alicyclic or acyclic \*. For example, we have found that treatment of methyl (+)-I 3-oxo-deisopropylideneneoabietate I (obtained