Aryl and arylmethyl C-glycosides through desulfitative stille and carbonylative stille cross-coupling of tinglycals and sulfonyl chlorides

The palladium-catalyzed cross-coupling of tinglucal and tingalactal derivatives with arenesulfonyl chlorides provides aryl C-glycoside precursors. Desulfitative carbonylative Stille cross-coupling between 1-naphthalenesulfonyl chloride and a tinglucal derivative gives, after stereoselective reduction of the keto moiety and stereoselective oxidative hydroboration, a protected form of 1-[(1S)-2,6-anhydro-L-glycero-D-gulo-heptitol-1-C-yl] naphthalene [beta-C-glucopyranoside of (S)-(naphtha-1-yl)methanol]. Benzyl C-glycoside precursors are obtained by desulfitative Stille coupling of phenylmethanesulfonyl chloride with the corresponding protected tinglycals.