Highly Enantioselective Organocatalytic Sulfa-Michael Addition to α,β-Unsaturated Ketones
作者:Nirmal K. Rana、Sermadurai Selvakumar、Vinod K. Singh
DOI:10.1021/jo902634a
日期:2010.3.19
A cinchona alkaloid-derived urea was found to be an efficient organocatalyst for catalyzing enantioselective conjugate addition between thiols and various α,β-unsaturated ketones to provide optically active sulfides with high chemical yields (up to >99%) and enantiomeric excess (up to >99% ee). The reaction was performed with 0.1 mol % of catalyst in toluene at room temperature. A transition state
发现金鸡纳生物碱衍生的尿素是催化硫醇与各种α,β-不饱和酮之间对映体选择性共轭加成的有效有机催化剂,可提供具有高化学收率(高达> 99%)和对映体过量(高达> 99%ee)。在室温下用0.1mol%的催化剂的甲苯溶液进行反应。已经提出了过渡状态模型来解释反应的立体化学结果。