Synthesis of Furanylalkyl Hex- and Pentenopyranosid-4-uloses

A few novel furanylalkyl hex- and pentenopyranones have been synthesized from the corresponding hexenopyranosides or hydroxymethylfurfural. In the hexose series, the reactions proceeded through monosilylation of the primary alcohol followed by oxidation of secondary alcohols. The pentenopyranones have been obtained by glycosidation of hydroxymethylfurfural oxidation product.