Rapid chiral assay of amino compounds using diethyl squarate
作者:Jun Tian、Yi-Xuan Jiang、Xiao-Qi Yu、Shan-Shan Yu
DOI:10.1016/j.saa.2022.120871
日期:2022.5
importance of chiralcompounds make it urgent to develop fast and efficient methods to detect the absolute configuration, enantiomeric excess(ee), and concentration of chiralcompounds. In this study, we demonstrate that commercially available diethyl squarate can rapidly react with various types of chiral amino compounds and exhibit characteristic ultraviolet (UV) and circular dichroism (CD) signals.
手性化合物的多功能性和重要性使得开发快速有效的方法来检测绝对构型、对映体过量(ee) 和手性化合物的浓度。在这项研究中,我们证明了市售的方酸二乙酯可以与各种类型的手性氨基化合物快速反应,并表现出特征性的紫外 (UV) 和圆二色性 (CD) 信号。UV 和 CD 信号可以分别确定两种对映体的总浓度和样品的 ee 值。该探针显示出广泛的底物范围,适用于 39 种测试的手性氨基化合物,包括手性氨基酸、氨基醇和胺。此外,该探针准确检测了10个苯丙氨酸、苯基甘氨醇和苯乙胺样品,误差范围小于8%,证明了该方法的实用性。
Chiral squaramide as multiple H-bond donor organocatalysts for the asymmetric Michael addition of 1,3-dicarbonyl compounds to nitroolefins
作者:Ze Dong、Guofu Qiu、Hai-Bing Zhou、Chune Dong
DOI:10.1016/j.tetasy.2012.10.016
日期:2012.12
A series of chiral bifunctional squaramide multiple H-bond donor organocatalysts have been designed and synthesized by the rational assembly of chiral privileged scaffolds of indanol and cinchona alkaloids. In the presence of 1 mol % 1a, the asymmetric Michael addition reaction of 1,3-dicarbonyl compounds to nitroolefins proceeded to provide the product in high yields (up to 92%) and with good to high