A new synthesis of mono C-glycosyl derivatives of dialdehyde sugars using a Michael additionlaldol condensation sequence has been developed. It is complementary to previously reported methods for the production of C-glycosyl compounds. The synthesis involves the Michael addition reaction of an enol silyl ether with acetylbenzoquinone followed by an aldol condensation and subsequent aromatization of the resulting hydroxy ketone. The aldol condensation proceeds only under select conditions and affords the unstable ketols 7 and 15.
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