Synthesis and Photophysical Study of Heteropolycyclic and Carbazole Motif: Nickel-Catalyzed Chelate-Assisted Cascade C–H Activations/Annulations
作者:Namrata Prusty、Shyam Kumar Banjare、Smruti Ranjan Mohanty、Tanmayee Nanda、Komal Yadav、Ponneri C. Ravikumar
DOI:10.1021/acs.orglett.1c03234
日期:2021.12.3
through sequential C–H bond activations has been described. Regioselective indole C2/C3 functionalization has been achieved in the presence of indole C7-H, which is quite challenging. In addition, this approach also gives easy access to building a heteropolycyclic motif through C6/C7 C–H functionalization of indoline. This methodology is not limited to aromatic internalalkynes as coupling partners; aliphatic
Iron-Catalyzed C(sp<sup>2</sup>)–H Alkylation of Indolines and Benzo[<i>h</i>]quinoline with Unactivated Alkyl Chlorides through Chelation Assistance
作者:Rahul A. Jagtap、Pragnya Paramita Samal、C. P. Vinod、Sailaja Krishnamurty、Benudhar Punji
DOI:10.1021/acscatal.0c02030
日期:2020.7.2
Regioselective C–H bond alkylation of indolines and benzo[h]quinoline with a wide range of unactivated and highly demanded primary and secondary alkyl chlorides is accomplished using a low-cost ironcatalyst. This reaction tolerates diverse functionalities, such as C(sp2)–Cl, fluoro, alkenyl, silyl, ether, thioether, pyrrolyl, and carbazolyl groups including cyclic and acyclic alkyls as well as alkyl-bearing
使用低成本的铁催化剂可完成二氢吲哚和苯并[ h ]喹啉的区域选择性C–H键烷基化反应,以及大量未活化且要求很高的伯和仲烷基氯。该反应可耐受多种官能团,例如C(sp 2)–Cl,氟,烯基,甲硅烷基,醚,硫醚,吡咯基和咔唑基,包括环状和非环状烷基以及带有烷基的脂肪醇和多环甾体部分。所证明的铁催化方案通过五元或六元金属环进行。有趣的是,C-7烷基化的二氢吲哚可以很容易地官能化为游离的NH吲哚啉/吲哚和色胺衍生物。详细的机械研究重点介绍了活性Fe(I)催化剂的参与和卤素原子通过单电子基机理转移的过程。氘标记和动力学分析表明,吲哚的C–H金属化是可能的营业额限制步骤。总体而言,实验和理论研究支持了烷基化反应的Fe(I)/ Fe(III)途径,该途径包括烷基氯的两步单电子氧化加成。
Rhodium(<scp>iii</scp>)-catalyzed C7-position C–H alkenylation and alkynylation of indolines
A Rh(III)-catalyzedregioselective C-H alkenylation and alkynylation of indolines is described. This protocol relies on the use of a removable pyridinyl directinggroup to access valuable C-7 functionalized indoline scaffolds with ample substrate scope and broad functional group tolerance.
Ruthenium(II)-Catalyzed Site-Selective Hydroxymethylation of Indolines with Paraformaldehyde
作者:Suk Hun Lee、Taejoo Jeong、Kunyoung Kim、Na Yeon Kwon、Ashok Kumar Pandey、Hyung Sik Kim、Jin-Mo Ku、Neeraj Kumar Mishra、In Su Kim
DOI:10.1021/acs.joc.8b02873
日期:2019.2.15
The facile synthesis of hydroxymethylated indole derivatives is crucial for their further development as pharmaceutical compounds and other synthetic purposes. Herein, we describe the ruthenium(II)-catalyzed hydroxymethylation of indolines and other N-heterocycles using paraformaldehyde as an abundant C1 feedstock. A wide substrate scope range and high levels of site selectivity as well as functional
Nickel-Catalyzed Tandem Cyclization of 1,6-Diynes with Indolines/Indoles through Dual C–H Bond Activation
作者:Suresh Kumar Yadav、Masilamani Jeganmohan
DOI:10.1021/acs.joc.3c01463
日期:2023.10.20
A nickel-catalyzed site-selective tandem cyclization of 1,6-diynes with substituted indolines or indoles through consecutive dual C–H bond activation is described. In the reaction, substituted fused indole and carbazole derivatives were observed in good to excellent yields, in which three consecutive C–C bonds formed in one pot. Later, in the presence of DDQ, the aromatization of the indoline derivative