Synthesis of the Branched-Chain Sugar Aceric Acid: A Unique Component of the Pectic Polysaccharide Rhamnogalacturonan-II
作者:Nigel A. Jones、Sergey A. Nepogodiev、Colin J. MacDonald、David L. Hughes、Robert A. Field
DOI:10.1021/jo051012b
日期:2005.10.1
Described herein is the synthesis of 3-C-carboxy-5-deoxy-l-xylose (aceric acid), a rare branched-chain sugar found in the complex pectic polysaccharide rhamnogalacturonan-II. The key synthetic step in the construction of aceric acid was the stereoselective addition of 2-trimethylsilyl thiazole to 5-deoxy-1,2-O-isopropylidene-α-l-erythro-pentofuran-3-ulose (2), which was prepared from l-xylose. The
本文描述了 3 - C-羧基-5-脱氧-1-木糖(醋酸)的合成,这是一种在复合果胶多糖鼠李糖半乳糖醛酸-II 中发现的稀有支链糖。醋酸酯合成的关键合成步骤是2-三甲基甲硅烷基噻唑与5-脱氧-1,2- O-异亚丙基-α- 1-赤型-戊呋喃-3-乌洛糖( 2 )的立体选择性加成反应制备得到来自l-木糖。噻唑基通过常规转化有效地转化为所需的羧基。醋酸也是通过 2 的 3 -C-亚甲基衍生物的二羟基化合成的然后氧化生成的羟甲基。醋酸的 C-2 差向异构体也使用噻唑加成化学合成,从 L-阿拉伯糖开始。