The combination of cerium(III) chloride heptahydrate and sodium iodide supported on silica gel is known to promote Michael-type additions. Continuing our work on solvent-free conditions, the CeCl3·7H2O−NaI−SiO2 system catalyzes the addition of a variety of indoles and nitroalkenes, giving 2-indolyl-1-nitroalkane derivatives in good yields. Development of this method has resulted in a new protocol for
已知负载在
硅胶上的七
水合氯化铈(III)和
碘化钠可促进迈克尔型添加。在无溶剂条件下继续我们的工作,CeCl 3 ·7H 2 O-NaI-SiO 2系统催化添加各种
吲哚和硝基
烯烃,从而以高收率得到2-
吲哚基-1-硝基
烷烃衍
生物。该方法的发展为合成4-取代的β-咔啉提供了新的方法。