Abstract
The sterically homogenous α,γ-disubstituted γ-butyrolactones trans- and cis-10 were degraded stereoselectively to the 1,3-diols anti-16 and syn-16, respectively. The key step of these transformations were Criegee rearrangements of peroxosulfonates derived from hemiketal peroxides. Syn-16 was transformed into the δ-valerolactone 19 which is a synthon for the compactin lactone. Anti-16 was similarly converted into the diastereomeric valerolactone iso-19.

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