Highly Stereoselective Synthesis and Structural Confirmation of a Fungal Metabolite, LL-P880β.

A fungal metabolite, LL-P880β [6S-(1'S, 2'R-dihydroxypentyl)-4-methoxy-5, 6-dihydropyran-2-one] (1), was synthesized unambiguously from diethyl (R, R)-tartrate (3) as a chiral pool via highly stereoselective construction of the C7'-asymmetric carbon of the intermediate 6, 8-dioxabicyclo[3.2.1]octane derivative (8a), and the stereochemistry of the C6-chiral center of the metabolite was chemically confirmed as (S).