Abstract
Ferrier rearrangement is one of the most fascinating reactions for installing diverse nucleophiles with high degree of stereoselectivity at the anomeric centre of the carbohydrate system toward the synthesis biologically active natural products. In carbohydrate chemistry, a reaction of glycosyl donor and acceptor catalyzed by various promoters is called glycosylation. Banik's glycosylation describes reaction of diverse hydroxy beta lactams with unsaturated glycals in the presence of iodine or bismuth nitrate as the catalysts.