A one-pot high-yielding synthesis of silylated 2,7-dioxabicyclo[2.2.1]heptanes from oxoallylsilanes is described. The mechanism of this tandem reaction is a sequential epoxidation of the allylsilane moiety and subsequent intramolecular cyclization. This simple protocol allows the synthesis of epoxy-bridged tetrahydropyrans from allene in two high-yield-
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