[reaction: see text] An efficient synthesis of 1,2-trans-glycosyl cyanides via 1,2-O-sulfinyl monosaccharides is described. Such S(N)2-type displacements at the anomeric center are stereospecific and are best performed with sodiumcyanide in the presence of ytterbium triflate. Significantly, the resulting 1,2-trans-glycosyl cyanides have a free hydroxyl group at C-2 ready for further modification.
New water-soluble benzimidazolone derivatives were synthesized. In the first approach, di-N-glycosyl and mono-N-alkyl-N-glycosyl compounds were obtained by grafting C-6-activated glycosides onto benzimidazolone. In the second approach, benzimidazolone derivatives bearing a glucosyl unit were synthesized using an efficient glycosylation method. Every compound structure was confirmed by means of NMR spectroscopy and elemental analysis. The preliminary surfactant properties of some compounds were evaluated. (c) 2007 Elsevier Ltd. All rights reserved.
Efficient O-glycosylation of diethyl oxoglutarate via 1,2-O-sulfinyl derivatives
1,2-O-Sulfinyl derivatives of D- and L-arabinose, D-xylose and D-glucose treated by potassium anion of diethyl oxoglutarate gave, exclusively, the corresponding O-glycosides in 92-97% yields. (C) 2007 Elsevier Ltd. All rights reserved.