Mirror-Image Carbohydrates: Synthesis of the Unnatural Enantiomer of a Blood Group Trisaccharide
作者:Fabien P. Boulineau、Alexander Wei
DOI:10.1021/jo035789l
日期:2004.5.1
pyranosides provide an expeditious entry into mirror-image oligosaccharides, as demonstrated in the synthesis of the unnatural enantiomer of the H-type II blood group determinant trisaccharide (d-Fuc-(α1→2)-l-Gal-(β1→4)-l-GlcNAc-β-OMe). This work illustrates that d-glucose, a common starting material in the synthesis of naturally occurring carbohydrates, can also be used to prepare their mirror-image analogues
d-葡萄糖苷甲基和d-葡萄糖五乙酸甲酯分别转化为甲基α- O-葡萄糖醛酸3和羟甲基β- C-葡萄糖醛酸9,它们可以有效地进行脱羧消除,从而生成4-deoxypentenoside 4和1 - glucal 10。这些不饱和吡喃糖苷提供迅速进入镜像寡糖,如在H-II型血型决定三糖(的不自然的对映异构体的合成证明d -Fuc-(α1→2) -升-Gal-(β1→ 4) -升-GlcNAc-β-OME)。这项工作说明了d-葡萄糖是天然存在的碳水化合物合成中常用的起始原料,也可用于制备其镜像类似物。