Organocatalytic enantioselective transient enolate protonation in conjugate addition of thioacetic acid to α-substituted N-acryloyloxazolidinones
作者:Rajshekhar A. Unhale、Nirmal K. Rana、Vinod K. Singh
DOI:10.1016/j.tetlet.2013.01.004
日期:2013.4
Organocatalytic conjugate addition of thioacetic acid to a series of α-substituted N-acryloyloxazolidin-2-ones followed by enantioselective protonation has been studied in the presence of thiourea catalysts derived from cinchona alkaloids. Conjugate addition/protonation adducts have been obtained up to 97% ee and high yields. The methodology could serve as an easy and practical route to the syntheses
在衍生自金鸡纳生物碱的硫脲催化剂存在下,已经研究了将硫代乙酸有机催化共轭加成到一系列α-取代的N-丙烯酰基恶唑烷丁二酮中,然后进行对映选择性质子化。已经获得了高达97%ee且高收率的共轭加成/质子化加合物。该方法可以作为合成有用的生物活性分子的简便实用途径。