Easy access to C-glycosides from aldonolactones by a Claisen-type chain-extension reaction

Article abstract of DOI:10.1016/S0040-4020(96)01079-4

Chain elongated 2,4-diuloses 2, 4, 6, 9-11, 24, 25 were conveniently obtained from the corresponding aldonolactones 1, 3, 5 by their reaction with carbonyl compounds in the presence of sodium hydride. These hemiacetalic products can be transformed into C-