作者:Jinhua J. Song、Zhulin Tan、Jonathan T. Reeves、Fabrice Gallou、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/ol050568i
日期:2005.5.1
carbene (NHC) catalyzed trifluoromethylation reaction of carbonyl compounds was discovered. Both enolizable and nonenolizable aldehydes and alpha-keto esters undergo facile trifluoromethylation with TMSCF3 at room temperature in the presence of only 0.5-1 mol % of the commercially available NHC (1), providing CF3-substituted alcohols in good yields. Selective trifluoromethylation of aldehydes over ketones
[反应:请参见文字]。发现了一种新型的N-杂环卡宾(NHC)催化羰基化合物的三氟甲基化反应。可烯化和不可烯化的醛和α-酮酯在室温下仅以0.5-1 mol%的NHC(1)存在时,可通过TMSCF3进行三氟甲基化反应,从而以高收率提供CF3取代的醇。在NHC催化下,可以实现醛在酮上的选择性三氟甲基化。这些条件温和而简单,并且可以耐受多种功能基团。