[3,3]-Sigmatropic Rearrangements in the Enantioselective Synthesis of (-)-Methylenolactocin

Abstract

A Pd(II)-catalyzed [3,3]-sigmatropic rearrangement is used to transfer chirality from an enantio-enriched alk-3-ene-1,2-diol to a C 2 -symmetrical alk-2-ene-1,4-diol which, in turn, can be converted into a precursor of (-)-methylenolactocin through an additional [3,3]-sigmatropic rearrangement (either Johnson orthoester or Ireland-Claisen rearrangement).