This work demonstrates trivalent tris-(3-N-methyl-N-pyridyl propyl)amine (1) catalyzing the site-selective mono-O-acylation of glycopyranosides. Different acid anhydrides were used for the acylation of monosaccharides, mediated by catalyst 1, at a loading of 1.5 mol%; the extent of site-selectivity and the yields of mono-O-acylation products were assessed. The reactions were performed between 2 and
这项工作证明了三价三-(3- N-甲基-N-
吡啶基丙基)胺( 1 )催化
吡喃糖苷的位点选择性单-O-酰化。在催化剂1的介导下,使用不同的酸酐对
单糖进行酰化,负载量为 1.5 mol%;评估了位点选择性的程度和单-O-酰化产物的产率。反应进行 2 至 10 小时,具体取决于酸酐的性质,其中体积较大的新
戊酸酐需要较长的酰化时间。
吡喃糖苷保持为二醇和三醇,并且从一组实验中观察到酰化的位点选择性遵循羟基官能团的内在反应性和立体
化学。与一价N , N-二甲
氨基吡啶 (
DMAP) 催化剂相比,三价催化剂1在所研究的
吡喃糖苷中以优异的位点选择性介导单-O-酰化产物形成的反应。这项研究说明了催化部分的多价性的好处。