3. Synthetic molecules
In what follows, it will be assumed that the spectra have been analyzed by the basic experiments, which will no longer be systematically commented on.
3.1 Determination of stereochemistry by NOE
The diagram below shows the expected stereochemistry of molecule 4. We need to check the opening of the epoxide and specify the relative stereochemistry of sites 7, 8, 8a . The couplings do not allow this.
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Synthetic molecules
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