Enantioselective Enolate Protonation in Sulfa–Michael Addition to α-Substituted <i>N</i>-Acryloyloxazolidin-2-ones with Bifunctional Organocatalyst
作者:Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol202808n
日期:2011.12.16
Organocatalytic conjugate addition of thiols to α-substituted N-acryloyloxazolidin-2-ones followed by asymmetric protonation has been studied in the presence of cinchona alkaloid derived thioureas. Both of the enantiomers are accessible with the same level of enantioselectivity using pseudoenantiomeric quinine/quinidine derived catalysts. The addition/protonation products have been converted to useful biologically
在金鸡纳生物碱衍生的硫脲的存在下,已经研究了硫醇向α-取代的N-丙烯酰基恶唑烷丁二酮的有机催化共轭加成反应,然后进行不对称质子化。使用假对映异构体奎宁/奎尼丁衍生的催化剂,两种对映体都可以以相同水平的对映体选择性获得。加成/质子化产物已转化为有用的生物活性分子。