N-Acetyl glucosamine and chitooligosaccharides are selectively converted into beta -glycosides without protection of the other hydroxyl groups by alkylation of the anomeric alkoxides in N,N-dimethylformamide containing lithium bromide. Addition of the lithium salt notably improves the stereoselectivity of the glycosylation of the monomer and the efficiency of the process with higher oligomers. (C) 2001 Elsevier Science Ltd. All rights reserved.
NISHIMURA, SHIN-ICHIRO;KURITA, KEISUKE;KUZUHARA, HIROYOSHI, CHEM. LETT.,(1990) N, C. 1611-1614