Establishing the True Structure of the Sorbicillinoid-Derived Isolate Rezishanone C by Total Synthesis.

The enantiomer, ent-4, of the true structure, 4, of the sorbicillinoid rezishanone C (sorbivinetone) has been synthesized from a homochiral cis-1,2-dihydrocatechol that is itself generated through the whole-cell biotransformation of toluene. These studies together with dispersion-corrected DFT calculations support the proposal that rezishanone C is an artefact of the isolation process and arises through a Diels-Alder reaction between ethyl vinyl ether and sorbicillinol (3).