327172-72-5Relevant academic research and scientific papers
Carbohydrate-derived spiroketals. Stereoselective synthesis of Di-d-fructose dianhydrides by boron trifluoride promoted glycosylation-spiroketalization of acetal precursors
Benito, Juan M.,Gomez-Garcia, Marta,Ortiz Mellet, Carmen,Garcia Fernandez, Jose M.,Defaye, Jacques
, p. 549 - 552 (2001)
(Matrix presented) Di-D-fructose 1,2′:2,1′-dianhydrides, dispiro-tricyclic disaccharides widely found in food materials, have been stereoselectively prepared in one-pot reaction from O-protected D-fructose 1,2-acetonide precursors by treatment with boron
Carbohydrate-derived spiroketals: Stereoselective synthesis of di-D-fructose dianhydrides
Benito, Juan M.,Rubio, Enrique,Gómez-García, Marta,Mellet, Carmen Ortiz,García Fernández, Jose M.
, p. 5899 - 5906 (2007/10/03)
A one-pot synthesis of di-D-fructose dianhydrides (DFAs) having the 1,6,9,13-tetraoxadispiro[4.2.4.2]tetradecane and 1,7,10,15-tetraoxadispiro[5.2. 5.2]hexadecane skeleton has been accomplished. The methodology relies on the ability of per-O-protected 1,2-O-isopropylidene β-D-fructofuranose and β-D-fructopyranose derivatives to undergo a tandem acetal cleavage-intermolecular glycosylation-intramolecular spiroketalization process by reaction with suitable acid promoters, such as boron trifluoride etherate or trifluoromethanesulfonic acid, in apolar organic solvents. Spirocyclization proceeds then under irreversible reaction conditions to give binary mixtures of di-D-fructofuranose (α,α and α,β diastereomers) or di-D-fructopyranose 1,2′:2,1′ dianhydrides (β,β and α,β), respectively, the stereochemical outcome being dependent on the non-participating or participating character of the protecting groups. Thus, benzylated and allylated derivatives afford, preferentially, the non-symmetric DFAs (α,β), with diastereomeric excess up to 92%. In contrast, the use of participating benzoyl groups favours the C2-symmetric diastereomer in both series.
