AN EFFICIENT AND PRACTICAL SYNTHESIS OF α-(1→3)-LINKED MANNOHEXAOSE AND MANNOOCTAOSE
作者:Langqiu Chen、Fanzuo Kong
DOI:10.1081/car-120014899
日期:2002.1.10
tetrasaccharide 22, respectively. The tetrasaccharide 20 was prepared from oxidative cleavage of 1-O-p-methoxyphenyl of 19, which was obtained from coupling of 9 with 11. The tetrasaccharide 22 was obtained from condensation of the donor 13 with the acceptor 18. These disaccharides 9, 11, 13, and 18 were produced easily by simple chemical transformation using p-methoxyphenyl 3-O-allyl-α-d-mannopyranoside (1) and
α-(1→3)-连接的甘露六糖和甘露糖八糖作为其甲基糖苷是由相应的α-(1→3)-连接的二-(9)和四糖供体(21)与四糖受体(23)缩合而合成的分别进行脱酰作用。分别通过激活四糖20的C-1和四糖22的脱甲酰作用容易地制备供体21和受体23。通过将9与11偶联获得的19的1-Op-甲氧基苯基的氧化裂解制备四糖20。通过供体13与受体18的缩合获得四糖22。这些二糖9、11、13 ,使用对甲氧基苯基3-O-烯丙基-α-d-甘露吡喃糖苷(1)和2,3,4通过简单的化学转化即可轻松制得18和