作者:Langqiu Chen、Fanzuo Kong
DOI:10.1016/s0008-6215(02)00285-9
日期:2002.11
A facile and practical method was developed for the synthesis of β-(1→3)-linked xylooligosaccharides. Dibezoylation of allyl α-d-xylopyranoside (1) afforded 2,4-dibenzoate 6 as the major product. Chloroacetylation of 6, followed by deallylation and trichloroacetimidation, gave a 1:3 α/β imidate (10 and 11) mixture. Coupling of the imidate mixture with 6 gave a disaccharide 13, whose dechloroacetylation
开发了一种简便实用的方法来合成β-(1→3)-连接的木寡糖。烯丙基α-d-吡喃吡喃糖苷(1)的二苯甲酰化得到2,4-二苯甲酸酯6作为主要产物。6的氯乙酰化,然后脱铝和三氯乙酰亚胺化,得到1:3的α/β亚氨酸酯(10和11)混合物。亚氨酸酯混合物与6偶联得到二糖13,其脱氯乙酰基化得到二糖受体16。过苯甲酰化木糖基α/β亚氨酸酯(7和8)混合物与6缩合得到二糖12。二糖供体为1:1α/β混合物。二糖供体混合物与二糖受体16的偶联产生四糖17。重复脱铝和三氯乙酰亚胺化将17转化为四糖供体混合物。四糖供体混合物与受体16的缩合得到六糖21。用饱和氨水-甲醇进行脱苯甲酰化,得到β-(1→3)连接的烯丙基木糖四糖苷和木糖六糖苷。