New entry to the perhydrofuro[2,3-b]furan ring system

Abstract
Treatment of the α-diazomalonate (6) with Rh2(OAc)4 stereoselectively provided substituted valerolactones (7) and (7′)via the [2,3]sigmatropic rearrangement of a nine-membered cyclic allylsulphonium ylide; the rearrangement product was converted to 5-alkylperhydrofuro[2,3-b]furan (12) by ozonolysis followed by acid treatment.

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