beta-D-glucopyranosyl-(1----2)-alpha-L- rhamnopyranoside. Together with previously synthesized tetrasaccharides of the Shigella flexneri Y O-antigen, this oligosaccharide has been used to study the conformation of O-antigens and to assist in the selection of S. flexneri, variant Y, specific monoclonal antibodies.
甲基2,4-二-O-苯甲酰基-α-L-鼠李
吡喃糖苷与2,3,4-三-O-乙酰基-α-
L-鼠李糖吡喃糖苷的糖基化反应得到甲基2,4-二-O-苯甲酰基-3 -O-(2,3,4-三-O-乙酰基-α-L-鼠李
吡喃糖基)-α-
L-鼠李糖吡喃糖苷(4),产率为93%。用二
溴甲基甲基醚将4转化成相应的糖基
溴化物。在Koenigs-Knorr条件下,该
溴化物与8-(甲氧羰基)辛基2-O-(2-乙酰
氨基-4,6-O-亚苄基-2-脱氧-β-
D-甘露糖基)-3,4-二-反应O-苄基-α-L-鼠李
吡喃糖苷,以91%的产率提供被保护的四糖。去除保护基团得到8-(甲氧基羰基)辛基O-α-L-鼠李
吡喃糖基-(1 ---- 3)-O-α-L-鼠李
吡喃糖基-(1 ---- 3)-O-2-乙酰
氨基-2-脱氧-β-
D-吡喃葡萄糖基-(1 ---- 2)-α-
L-鼠李糖吡喃糖苷。