Unconventional stereoselective one-pot synthesis of Knoevenagel-type indoles via in situ condensation of iminium salts with active methylene reagents
作者:Angelo Ranise、Francesco Lucchesini、Matteo Caviglia、Silvana Alfei、Andrea Spallarossa、Chiara Caneva
DOI:10.1016/j.tet.2013.10.086
日期:2013.12
Knoevenagel-type indoles is described. The method is based on the in situ reaction of indole iminium salts (four of them are fully characterized) with acyclic symmetrical and unsymmetrical active methylene reagents in the presence of triethylamine. In general, the overall yields are moderate to good. Some of relevant reaction parameters and steric effects affecting stereoselectivity are discussed.
描述了一种简单的一锅法,用于立体选择性合成Knoevenagel型吲哚。该方法基于在三乙胺存在下吲哚亚胺盐(已充分表征其中的四种)与无环对称和不对称活性亚甲基试剂的原位反应。总的来说,总产量是中等至良好。讨论了影响立体选择性的一些相关反应参数和空间效应。