Electronic Nature of Ketone Directing Group as a Key To Control C-2 vs C-4 Alkenylation of Indoles
作者:Veeranjaneyulu Lanke、Kiran R. Bettadapur、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.6b02698
日期:2016.11.4
A novel mode of achieving site selectivity between C-2 and C-4 positions in the indole framework by altering the property of the ketone directing group is disclosed. Methyl ketone, as directing group, furnishes exclusively C-2 alkenylated product, whereas trifluoromethyl ketone changes the selectivity to C-4, indicating that the electronic nature of the directing group controls the unusual choice between
公开了通过改变酮指导基团的性质实现在吲哚骨架中C-2和C-4位置之间的位点选择性的新模式。甲基酮作为导向基团仅提供C-2烯基化产物,而三氟甲基酮改变了对C-4的选择性,表明该导向基团的电子性质控制着5元和6元金属环之间的不寻常选择。 。对其他羰基衍生的导向基团的筛选显示强和弱的导向基团表现出相反的选择性。实验控制和氘代实验为提出的机制提供了支持。