Novel N-H and N-alkylatedderivatives of meridianins have been synthesized as potential antitumor agents by a two-step conversion of N-tosyl-3-acetylindoles or N-alkyl-3-acetylindoles to the corresponding enaminones using DMF-DMA, with or without added pyrrolidine. Further cyclization with guanidine gave the corresponding 2-aminopyrimidines. The structures of the compounds, thus obtained, were proved
通过使用DMF-DMA将N-甲苯磺酰基-3-乙酰基吲哚或N-烷基-3-乙酰基吲哚经两步转化为相应的烯胺酮,合成了经络胺的新型N- H和N-烷基化衍生物作为潜在的抗肿瘤药。或不添加吡咯烷。用胍进一步环化得到相应的2-氨基嘧啶。由此获得的化合物的结构通过1 H和13 C NMR光谱,NOE实验和X射线分析证明。
Rhodium(III)-Catalyzed Regioselective Direct C4-Alkylation and C2-Annulation of Indoles: Straightforward Access to Indolopyridone
作者:Aniruddha Biswas、Rajarshi Samanta
DOI:10.1002/ejoc.201701755
日期:2018.3.29
C4‐alkylation and C2‐annulation of indole derivative has been developed by using variable diazo esters. Fine tuning of the reactivity of diazo esters leads to control in regioselectivity with wide scope and functional‐group tolerance. A straightforward approach has been established to furnish an indolopyridone scaffold.
C4-arylation and domino C4-arylation/3,2-carbonyl migration of indoles by tuning Pd catalytic modes: Pd(<scp>i</scp>)–Pd(<scp>ii</scp>) catalysis <i>vs.</i> Pd(<scp>ii</scp>) catalysis
作者:Yaohang Cheng、Shijie Yu、Yuhang He、Guanghui An、Guangming Li、Zhenyu Yang
DOI:10.1039/d0sc05409g
日期:——
have been developed. The former route enables C4-arylation in a highly efficient and mild manner and the latter route provides an alternative straightforward protocol for synthesis of C2/C4 disubstituted indoles. The mechanism studies imply that the different reaction pathways were tuned by the distinct acid additives, which led to either the Pd(I)–Pd(II) pathway or Pd(II) catalysis.
吲哚的高效 C4-芳基化和多米诺 C4-芳基化/3,2-羰基迁移已经开发出来。前一种路线能够以高效且温和的方式实现C4-芳基化,后一种路线为合成C2/C4二取代吲哚提供了一种替代的简单方案。机理研究表明不同的反应途径是通过不同的酸添加剂调节的,从而导致 Pd()–Pd( II ) 途径或 Pd( II ) 催化。
Rh(III)-Catalyzed [5 + 1] Annulation of Indole-enaminones with Diazo Compounds To Form Highly Functionalized Carbazoles
A novel Rh(III)-catalyzed C–H activation/annulation cascade of indole-enaminones with diazocompounds was reported to construct diversely functionalized carbazole frameworks. The most notable characteristic is that this transformation could smoothly furnish a novel [5 + 1] cyclization product with good to excellent yields (up to 95%), accompanied by the thorough removal of acetyl and N,N-dimethyl groups
Ketone-Directed Cobalt(III)-Catalyzed Regioselective C2 Amidation of Indoles
作者:Xinxia Shi、Weiyan Xu、Rongchao Wang、Xiaofei Zeng、Huayu Qiu、Min Wang
DOI:10.1021/acs.joc.9b03018
日期:2020.3.6
An efficient cobalt(III)-catalyzed method for the direct C-H amidation of unprotected indoles for 2-amino indole scaffold construction has been developed. With dioxazolone as the amidating reagent, a variety of 2-amino indole derivatives were achieved in moderate to excellent yields using an organic acid as the additive and a ketone as the directing group.