On the synthesis of vinyl and phenyl C-furanosides by stereospecific debenzylative cycloetherification
作者:Riccardo Cribiù、K. Eszter Borbas、Ian Cumpstey
DOI:10.1016/j.tet.2009.01.014
日期:2009.3
diastereoselectivity of addition is dependent on whether a Grignard reagent or a trialkylzincate reagent is used. The open-chain compounds undergo a stereospecific cyclisation reaction on treatment with catalytic strong Brønsted acid with heating to form tetrahydrofurans with inversion of configuration at the allylic or benzylic carbon (C-1) and loss of hydroxyl from this position. A short synthesis
CYCLODEXTRIN—A CARRIER OR SYNTHON? SYNTHESIS OF PER-<i>O</i>-METHYL-β- CYCLODEXTRIN-GM<sub>3</sub>
作者:W. Haque、J. Diakur
DOI:10.1081/car-100102540
日期:2001.2.4
Cyclodextrins are currently under investigation for their utility as drug delivery agents. One property of the parent cyclic oligosaccharides which requires further modification for advanced drug delivery applications is that of site-directing capability. We have utilized beta -cyclodextrin as a starting material for the synthesis of the GM(3) trisaccharide and have conjugated this targeting ligand to a derivative of the parent beta -cyclodextrin. Synthesis of this cyclodextrin derivative, namely 18, is presented.
Hydrothermolysis of the Fully Benzylated α-Cyclodextrin
The treatment of the fully benzylated alpha-cyclodextrin with the hot compressed mixed solvent of dioxane/water (v/v=1/1) at 270 degreesC and 150 kg/cm(2) for 40 min afforded 2,3,6-tri-O-benzyl-D-glucopyranose in good yield. The hydrothermolysis of the fully benzylated alpha-cyclodextrin at 240 degreesC produced partially benzylated maltooligosaccharide derivatives.