Practical Stereoselective Synthesis of an α-Trifluoromethyl-α-alkyl Epoxide via a Diastereoselective Trifluoromethylation Reaction
作者:Jinhua J. Song、Zhulin Tan、Jinghua Xu、Jonathan T. Reeves、Nathan K. Yee、Ranjit Ramdas、Fabrice Gallou、Katie Kuzmich、Lisa DeLattre、Heewon Lee、Xuwu Feng、Chris H. Senanayake
DOI:10.1021/jo061839l
日期:2007.1.1
A practical stereoselective synthesis is reported for an α-trifluoromethyl-α-alkyl epoxide (1), which is an important pharmaceutical intermediate. The key step involves a chiral auxiliary-controlled asymmetric trifluoromethylation reaction for the introduction of the unique trifluoromethyl-substituted tertiary alcohol stereogenic center in the target molecule. The fluoride-initiated CF3 addition to
据报道,对于重要的药物中间体α-三氟甲基-α-烷基环氧化物(1),有一种可行的立体选择性合成方法。关键步骤涉及手性辅助控制的不对称三氟甲基化反应,用于在目标分子中引入独特的三氟甲基取代的叔醇立体异构中心。向手性酮酯6a中氟化物引发的CF 3加成反应的非对映选择性高达86:14。通过粗产物混合物的简单结晶,可以容易地以> 99.5:0.5dr获得主要的非对映异构体。