first Pd-catalyzed directC–Hacylation of indoles at the C4 position with α-oxocarboxylic acids using a ketone directinggroup is described. This reaction exhibits high regioselectivity with the tolerance of a wide scope of functional groups to afford diverse acylated indoles in moderate-to-good yields. The control experiments evidence the generation of acyl radicals via K2S2O8 promoted decarboxylation
描述了使用酮基直接基团的α-氧代羧酸在C4位上的Pd催化的第一个Pd的吲哚直接C–H酰化反应。该反应显示出高的区域选择性,并具有宽范围的官能团的耐受性,以中等至良好的产率提供了各种酰化的吲哚。对照实验证明了通过K 2 S 2 O 8促进α-氧代羧酸的脱羧作用以及Pd II / Pd IV催化循环的参与产生了酰基基团。重要的是,观察到的合成有用的选择性可用于制备具有抗肿瘤活性的吲哚衍生物作为微管蛋白抑制剂。
Palladium-Catalyzed Weak-Chelation-Assisted C4-Nitration of Indoles with <i>tert</i>-Butyl Nitrite: Formal Access to Aminated Indoles