C-5′-Substituted Cinchona Alkaloid Derivatives Catalyse the First Highly Enantioselective Dynamic Kinetic Resolutions of Azlactones by Thiolysis
作者:Carole Palacio、Stephen J. Connon
DOI:10.1002/ejoc.201300451
日期:2013.8
The highly enantioselective dynamic kinetic resolution (DKR) of azlactones by thiolysis has been achieved for the first time. Although both the parent alkaloid quinine and known C-5′-urea derivatives fail to promote the reaction effectively, a new class of C-5′-hydroxylated catalysts proved capable of catalysing the DKR of a range of azlactones derived from both unbranched- and, previously challenging
首次实现了硫解对吖内酯的高度对映选择性动态动力学拆分 (DKR)。尽管母体生物碱奎宁和已知的 C-5'-尿素衍生物都不能有效地促进反应,但证明了一类新的 C-5'-羟基化催化剂能够催化一系列衍生自无支链和无支链的吖内酯的 DKR。 ,以前具有挑战性的 84-92% ee 的支链氨基酸,包括合成富含对映体的 N 保护硫酯的例子,该硫酯来源于从默奇森陨石中分离的外星氨基酸。