Synthetic study toward tridachiapyrone B

Beilstein J Org Chem. 2022 Dec 19:18:1741-1748. doi: 10.3762/bjoc.18.183. eCollection 2022.

Abstract

A convergent approach to the skeleton of tridachiapyrone B is described taking advantage of the desymmetrization of α,α'-dimethoxy-γ-pyrone leading to α-crotyl-α'-methoxy-γ-pyrone in one step. To construct the quaternary carbon of the 2,5-cyclohexadienone of the target, a strategy based on the Robinson-type annulation of an aldehyde derived from α-crotyl-α'-methoxy-γ-pyrone was applied. The grafting of the simplified target's side chain was demonstrated through an oxidative anionic oxy-Cope rearrangement of the tertiary alcohol arising from the 1,2-addition of a 1,3-dimethylallyl reagent to 2,5-cyclohexadienone connected to the α'-methoxy-γ-pyrone motif.

Keywords: 2,5-cyclohexadienone; Robinson-type annulation; oxy-Cope; quaternary carbon; α’-methoxy-γ-pyrone.

Grants and funding

MC thanks Ministère de la Recherche et de l’Education Nationale for a Ph.D. fellowship. This work has been partially supported by CNRS, Normandie University, INSA Rouen, Labex SynOrg (ANR-11-LABX-0029) and Région Normandie (CRUNCh network).