[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.
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.
GAGNIEU, CHRISTIAN H.;GUILLER, ALAIN;PACHECO, HENRI, CARBOHYDR. RES., 180,(1988) N 2, C. 233-242
作者:GAGNIEU, CHRISTIAN H.、GUILLER, ALAIN、PACHECO, HENRI