The asymmetric carbonyl-ene reaction of trifluoropyruvate with five alkenes catalysed by [Pd(R)-BINAP}](SbF6)2 were carried out in good yields and enantioselectivities (up to 96% yield and 96% ee) in low antimicrobial toxicity C2-substituted imidazolium ionic liquids (ILs). Toxicity data was included in the selection criteria for reaction optimisation after a preliminary IL screen. The Pd(II) catalyst immobilised in an IL was recycled and reused up to 7 times without decrease of either yield or ee. One IL prepared, which was determined to be of high antimicrobial toxicity was assigned a low priority for future applications.
在低抗菌毒性的C2取代
咪唑鎓
离子液体(ILs)中,三
氟丙酮酸与五种烯烃的非对称羰基-烯反应在[Pd(R)-BINAP}](SbF6)2催化下,实现了良好的产率和立体选择性(最高达96%产率和96% ee)。在初步的IL筛选后,毒性数据被纳入反应优化的选择标准。固定在IL中的Pd(II)催化剂可回收并重复使用多达7次,且产率和ee均无下降。一种制备的IL被确定具有高抗菌毒性,因此被赋予低优先级用于未来的应用。