Nazarov Cyclization Entry to Chiral Bicyclo[5.3.0]decanoid Building Blocks and Its Application to Formal Synthesis of (-)-Englerin A

Org Lett. 2017 Oct 6;19(19):5142-5145. doi: 10.1021/acs.orglett.7b02428. Epub 2017 Sep 27.

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.

Publication types

  • Research Support, Non-U.S. Gov't