73415-91-5Relevant articles and documents
Arylboronic acid-mediated glycosylation of 1,2-dihydroxyglucoses
Izumi, Sanae,Kobayashi, Yusuke,Takemoto, Yoshiji
, p. 350 - 362 (2019/07/31)
- We explored direct dehydrative coupling of tetrahydro-2H-pyran-2,3-diol or a 1,2-dihydroxy sugar with various alcohols using a range of arylboronic acids. Among the catalysts, 2-borono-4-trifluoromethylbenzoic acid efficiently promoted acetalization of tetrahydro-2H-pyran-2,3-diol. Ferroceniumboronic acid showed the best catalytic activity for glycosylation of the 1,2-dihydroxy sugar. The major products were 1,2-cJi-a-D-glucopyranosides.
Stereoselective β-mannosylation via anomeric O-alkylation: Formal synthesis of potent calcium signal modulator acremomannolipin A
Li, Xiaohua,Berry, Nader,Saybolt, Kevin,Ahmed, Uddin,Yuan, Yue
, p. 2069 - 2072 (2017/05/04)
Stereoselective β-mannosylation has been investigated via cesium carbonate-mediated anomeric O-alkylation of D-mannose-derived lactol with various electrophiles. It was found that electrophiles bearing trifluoromethanesulfonate (triflate) as the leaving g
Triisobutylaluminium and dusobutylaluminium hydride as molecular scalpels: The regioselective stripping of perbenzylated sugars and cyclodextrins
Lecourt, Thomas,Herault, Alexandre,Pearce, Alan J.,Sollogoub, Matthieu,Sinay, Pierre
, p. 2960 - 2971 (2007/10/03)
To explain the remarkable regioselective de-O-benzylating properties of diisobutylaluminium hydride (DIBAL-H) and triisobutylaluminium (TIBAL) towards polybenzylated sugars or cyclodextrins, we propose a plausible mechanistic rationale critically involving the kinetic formation of a product-generating 2:1 Al-benzylated sugar complex. For the reaction to occur, one pair of adjacent oxygen atoms should first be able to form a chelation complex with the first equivalent of aluminium reagent, either a highly fluxional complex with tetracoordinate aluminium species or a pentacoordinate one. The second equivalent then induces the regioselectivity of the de-O-alkylation by coordinating preferentially to one of the oxygen atoms of the selected pair.