A convenient synthesis of 4-amino-4-deoxy-l-arabinose and its reduction product, 1,4-dideoxy-1,4-imino-l-arabinitol
作者:John J. Naleway、Christian R.H. Raetz、Laurens Anderson
DOI:10.1016/0008-6215(88)84118-1
日期:1988.8
Methyl 2,3-di-O-acetyl-4-azido-4-deoxy-alpha-L-arabinopyranoside, from the diol, appears (1H-n.m.r. data) to exist as an equilibrating mixture of the 4C1 and 1C4 conformers in chloroform solution. The reduction of the azido sugar by hydrogen over Pd/C in .6M HCl yielded 4-amino-4-deoxy-L-arabinopyranose as its hydrochloride; in 0.1M HCl, further reactions occurred to give 1,4-dideoxy-1,4-imino-L-arabinitol
N,N-二甲基甲酰胺和含少量氯化氢的2-甲氧基丙烯的混合物中的甲基β-D-吡喃吡喃糖苷主要产生2,3-O-异亚丙基衍生物,该衍生物易于转化为其4-三氟甲磺酸酯。三氟甲磺酸酯基团的容易取代得到4-叠氮基-4-脱氧-α-L-阿拉伯吡喃果糖苷衍生物,在温和的酸处理下,将其水解为2,3-二醇,或在更剧烈的条件下水解为4-叠氮基-4-脱氧-L-阿拉伯糖。来自二醇的甲基2,3-二-O-乙酰基-4-叠氮基4-脱氧-α-L-阿拉伯吡喃果糖苷(1H-nmr数据)以氯仿中4C1和1C4构象异构体的平衡混合物形式存在解。在0.6M HCl中,在Pd / C上用氢还原叠氮糖,得到4-氨基-4-脱氧-L-阿拉伯吡喃葡萄糖酸盐。在0.1M HCl中 发生进一步反应,得到1,4-二脱氧-1,4-亚氨基-L-阿拉伯糖醇为最终产物。Raetz等人从沙门氏菌突变体分离的脂质A前体IIA中的氨基脱氧戊糖。1985年,TLC,1