No abstract

Bi(NO 3 ) 3 , a low-cost, mild, and environmentally green catalyst, has been successfully utilized for Fischer glycosylation for the synthesis of alkyl/aryl glycopyranosides by reacting unprotected sugars, namely, D-glucose, L-rhamnose, D-galactose, D-arabinose, and N-acetyl-D-glucosamine with various alcohols in good to excellent yields. The glycosides were formed with high α-selectivity. Further, an expedient separation of α-and β-glycosides using silver nitrate-impregnated silica gel flash liquid chromatography has been developed.

Direct Glycosylation of Unprotected and Unactivated Sugars Using Bismuth Nitrate Pentahydrate. -Bismuth nitrate pentahydrate acts as an effective catalyst for the glycosylation of unactivated sugars (examples for the reaction of 5 sugars with nine alcohols are given). The separation of and -glycosides using silver nitrate-impregnated silica gel flash liquid chromatography is also described. -(POLANKI, I. K.; KURMA, S. H.; BHATTACHARYA*, A. K.; J. Carbohydr. Chem. 34 (2015) 4, 196-205, http://dx.

An efficient and convenient method for the synthesis of biologically active benzodiazepine derivatives via Bi‐catalyzed condensation reactions of o‐phenylenediamines with ketones at room temperature or microwave irradiation condition is given.