Synthesis of some d-mannosyl-oligosaccharides containing the methyl and 4-nitrophenyl β-d-mannopyranoside units
作者:Shaheer H. Khan、Rakesh K. Jain、Khushi L. Matta
DOI:10.1016/0008-6215(90)80005-n
日期:1990.10
3-O-isopropylidene-beta-D-mannopyranoside (11), and 4-nitrophenyl 2,3-O-isopropylidene-beta-D-mannopyranoside (12) were each condensed with 2,3,4,6-tetra-O-acetyl-alpha-D-mannopyranosyl bromide (1) in the presence of mercuric cyanide, to give after deprotection, methyl 2-(5) and 6-O-alpha-D-mannopyranosyl-beta-D-mannopyranoside (15), and 4-nitrophenyl 6-O-alpha-D-mannopyranosyl-beta-D-mannopyranoside
甲基3,4,6-三-O-苄基-β-D-甘露吡喃糖苷(2),甲基2,3-O-异亚丙基-β-D-甘露吡喃糖苷(11)和4-硝基苯基2,3-O-在氰化汞的存在下,将异丙叉基-β-D-甘露吡喃糖苷(12)与2,3,4,6-四-O-乙酰基-α-D-甘露吡喃糖基溴(1)缩合,在脱保护后得到甲基2-(5)和6-O-α-D-甘露吡喃糖基-β-D-甘露吡喃糖苷(15)和4-硝基苯基6-O-α-D-甘露吡喃糖基-β-D-甘露糖吡喃糖苷(20)。11与3,4,6-三-O-乙酰基-2-O-(2,3,4,6-四-O-乙酰基-α-D-甘露吡喃糖基)-α-D-甘露吡喃糖基的类似缩合溴化物(21)和2,3,4-三-O-乙酰基-6-O-(2,3,4,6-四-O-乙酰基-α-D-甘露吡喃糖基)-αD-甘露酰吡喃糖基溴化物( 25),然后去除保护基,得到甲基O-α-D-甘露吡喃糖基-(1 ---- 2)-O-α-D-甘露吡喃糖基-(1