化学选择性合成N稠合杂环的有效级联方法,包括9 H-吡咯并[1,2- a ]吲哚,3 H-吡咯并[1,2- a ]吲哚和1 H-吡咯并[1,2- a ]已开发出吲哚衍生物。这种转变是通过三氟甲磺酸银(I)催化的连续Friedel-Crafts反应/ NC键在易于获得的炔丙醇和3取代的1 H-吲哚之间形成的顺序进行的。不仅可以根据炔丙醇的取代方式观察到极好的化学选择性,而且路易斯酸催化的NC键形成过程可以在无碱和无配体的条件下进行。
By employing copper dibromide as a catalyst, Michael addition–condensation of 3‐substitutedindoles with α,β‐unsaturated ketimines was realized. The reactions afforded a large variety of 9H‐pyrrolo[1,2‐α]indoles with good yields (up to 99 %). In addition, a plausible reaction mechanism was proposed.