Synthesis and Structural Verification of the Xylomannan Antifreeze Substance from the Freeze-Tolerant Alaskan Beetle Upis ceramboides
作者:David Crich、Md. Yeajur Rahaman
DOI:10.1021/jo201780e
日期:2011.11.4
from the freeze-tolerant Alaskan beetle Upis ceramboides have been accessed by total chemical synthesis. Comparison of their NMR spectral data with data of the isolate lends strong support to the proposed structure. Synthetic tetrasaccharides representing various linkage isomers considered (α- rather than β-manno, and linkage through mannose O3 rather than O4) show more significant chemical shift differences
四- ,六- ,和[→4)-β-的八糖亚基d -Man p - (1→4)-β- d -Xyl p - (1→] Ñ木糖甘露聚糖基序提出了作为一个新颖的结构来自耐冻阿拉斯加甲虫Upis ceramboides 的非蛋白质、产生热滞后的防冻物质已通过全化学合成获得。将它们的 NMR 光谱数据与分离物的数据进行比较为所提出的结构提供了强有力的支持。代表各种连接异构体的合成四糖考虑到(α-而不是 β-甘露糖,通过甘露糖 O3 而不是 O4 连接)显示出与分离物更显着的化学位移差异,因此被排除在进一步考虑之外。