Mild and Selective Ru-Catalyzed Formylation and Fe-Catalyzed Acylation of Free (N–H) Indoles Using Anilines as the Carbonyl Source
摘要:
C3-selective formylation and acylation of free (N-H) indoles under mild conditions can be achieved by using Ru- and Fe-catalyzed oxidative coupling of free (N-H) indoles with anilines, respectively. Both processes are operationally simple, compatible with a variety of functional groups and generally provide the desired products in good yields. (13)C-labeling experiments unambiguously established that the carbonylic carbon in the formylation products originated from methyl group of N-methyl aniline.
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。
Synthesis of 3-acylindoles via decarboxylative cross-coupling reaction of free (NH) indoles with α-oxocarboxylic acids
作者:Li-Jun Gu、Ji-Yan Liu、Li-Zhu Zhang、Yong Xiong、Rui Wang
DOI:10.1016/j.cclet.2013.10.004
日期:2014.1
Abstract A convenient and general method for acylation of free (N H) indoles via palladium-catalyzed decarboxylative cross-coupling reaction was developed. This process provided a useful method for the preparation of diverse 3-acylindoles in high yields utilizing a reaction with readily accessible reactants undermildconditions.
Decarboxylative/decarbonylative C3-acylation of indoles via photocatalysis: a simple and efficient route to 3-acylindoles
作者:Qing Shi、Pinhua Li、Xianjin Zhu、Lei Wang
DOI:10.1039/c6gc00516k
日期:——
A simple and efficient strategy for the preparation of 3-acylindoles via visible-light promoted C3-acylation of free (NH)- and N-substituted indoles with a-oxocarboxylic acids was developed. The reaction tolerates a wide...
Decarboxylative acylation of <i>N</i>-free indoles enabled by a catalytic amount of copper catalyst and liquid-assisted grinding
作者:Jingbo Yu、Chao Zhang、Xinjie Yang、Weike Su
DOI:10.1039/c9ob00622b
日期:——
A facile decarboxylativeacylation of N-free indoles with α-ketonates via liquid-assisted grinding was reported. The reaction requires only a catalytic amount of Cu(OAc)2·H2O in combination with O2 as the terminal oxidant to give various 3-acylindoles with high efficiency. Additionally, this new methodology was applicable to a gram-scale synthesis.