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
Methyl α-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
使用固定化的脂酶将几种模型酚和非酚乙烯基酯酰化作为模型受体的甲基α- d-吡喃葡萄糖苷。研究了供体特异性和反应的区域选择性。结构上不同的供体的转化率和酰化速率表明,Lipolase的合成反应性对应于A型阿魏酸酯酶的水解活性。Lipolase对甲基α- d-吡喃葡萄糖苷的主要位置表现出显着的区域选择性。当酚酸的乙烯基酯(羟基苯甲酸酯,羟基苯基链烷酸酯和羟基肉桂酸酯)用作酰基供体时,酰化作用仅发生在6- O主位置。除了主要的6- O-酰基产品(52–79%)外,2,6-二-使用非酚供体时,从反应混合物中分离出O-酰化衍生物(2-13%)(酚酸的完全甲氧基化衍生物的乙烯基酯,以及苯甲酸乙烯酯,肉桂酸酯或某些杂环类似物)。