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.

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.

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.