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A divergent entry to the chiral bicyclo[5.3.0]decane skeletons relevant to sesqui- and higher terpenoids has been achieved. Its usefulness was demonstrated by formal synthesis of a guaiane sesquiterpenoid (-)-englerin A.… Click to show full abstract
A divergent entry to the chiral bicyclo[5.3.0]decane skeletons relevant to sesqui- and higher terpenoids has been achieved. Its usefulness was demonstrated by formal synthesis of a guaiane sesquiterpenoid (-)-englerin A. The key reactions are (i) diastereoselective Nazarov cyclization for stereoselective construction of the bicyclo[5.3.0]decane skeleton, (ii) intramolecular C-H amination for tuning an oxidation state, and (iii) introduction of an alkyl group to a β-alkoxy ketone with a zinc(II) ate complex.
Journal Title: Organic letters
Year Published: 2017
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