Donor specificity and regioselectivity in Lipolase mediated acylations of methyl α-d-glucopyranoside by vinyl esters of phenolic acids and their analogues
作者:Mária Mastihubová、Vladimír Mastihuba
DOI:10.1016/j.bmcl.2013.07.051
日期:2013.10
Methylα-d-glucopyranoside as a model acceptor was acylated by several phenolic and non-phenolic vinyl esters using immobilised Lipolase. Donor specificity and regioselectivity of reaction were investigated. Conversion and rate of acylation by structurally varied donors indicates that the synthetic reactivity of Lipolase corresponds to the hydrolytic activity of feruloyl esterase type A. Lipolase exhibited
AbstractChromogenic substrate 4-nitrophenyl gallate was prepared in four steps and used for selection of hydrolases specific to gallic ester hydrolysisfrom among 22 commercial lipases, proteases, and crude glycanase cocktails. Enzymes displaying galloyl esterase activity were tested in regioselective galloylation of methyl β-d-glucopyranoside with vinyl gallate. Lipozyme TL IM in acetonitrile was
摘要分四步制备有色底物4-硝基苯基没食子酸酯,并用于从22种商业脂肪酶,蛋白酶和粗制聚糖酶混合物中选择对没食子酸酯水解具有特异性的水解酶。在甲基β- d-吡喃葡萄糖苷与没食子酸乙烯酯的区域选择性地没食子酰化中,测试了显示出没食子酰基酯酶活性的酶。发现乙腈中的Lipozyme TL IM具有最高的转化率(37%)。反应以对吡喃葡萄糖苷环的伯羟基严格的区域选择性进行,以制备规模得到作为唯一产物的纯化的甲基6 - O -galloyl-β- d-吡喃葡萄糖苷27%。 图形概要