作者:P. A. Illarionov、V. I. Torgov、I. I. Hancock、V. N. Shibaev
DOI:10.1023/a:1014035613269
日期:——
In connection with studies on the biosynthesis of capsular polysaccharides from Staphylococcus aureus, a new synthesis of uridine 5'-(2-acetamido-2,6-dideoxy-alpha-D-galactopyranosyl diphosphate) (uridine 5'-diphospho-N-acetyl-alpha-D-fucosamine) using 2-azido-3,4-di-O-acetyl-2,6-dideoxy-alpha-D-galactopyranosyl nitrate as the key intermediate was carried out. The reaction of this product with cesium dibenzyl phosphate smoothly affords the corresponding beta-glycosyl dibenzyl phosphate, which undergoes anomerization on treatment with BF(3).Et(2)O and 2-bromopyridine to give alpha-glycosyl dibenzyl phosphate in high yield. This product was then transformed into 2-amino-3,4-di-O-acetyl-2,6-dideoxy-alpha-D-galactopyranosyl phosphate, subsequently converted into 2-acetamido-2,6-dideoxy-alpha-D-galactopyranosyl phosphate and the target nucleoside diphosphate sugar.