A gold(I)-catalyzed hydroamination/cycloisomerization cascade reaction was developed to yield indolizino[8,7-b]indole and indolo[2,3-a]-quinolizine derivatives from 2-ethynyltryptamides. The optimal conditions were determined by condition screening, and the functional group tolerances of these reactions were explored based on synthetic substrates. An insight into the explanation on the selectivity
开发了
金(I)催化的加
氢胺化/环化异构化级联反应,从2-
乙炔基色酰胺中产生
吲哚并[8,7- b ]
吲哚和
吲哚[2,3- a ]-喹嗪衍
生物。通过条件筛选确定了最佳条件,并根据合成底物探索了这些反应的官能团耐受性。通过密度泛函理论计算,深入了解了闭环选择性的解释。提出了级联反应的合理机制。
吲哚并[8,7- b ]
吲哚的衍生化和诺环定的全合成证明了该策略的实用性。