Our success in preparing tetrahydrofuran products prompted us to examine the analogous preparation of 1'-silanoxytetrahydropyrans (Scheme 5). With substrate 63, desired product formed in a modest 10% yield (Scheme 5, Entry 1). Replacing one of the chain carbons with an oxygen heteroatom increased product formation slightly (Scheme 5, Entry 2). The principle of Thorpe and Ingold is often applied to dramatically increase the rate of cyclization reactions. In line with their observations, with substrates containing gem-dialkyl substitutents (Scheme 5, Entries 3-6), the corresponding silanoxy-tetrahydropyran products formed in synthetically useful yields.