Cu-Catalyzed Couplings of Heteroaryl Primary Amines and (Hetero)aryl Bromides with 6-Hydroxypicolinamide Ligands
作者:David J. Bernhardson、Daniel W. Widlicka、Robert A. Singer
DOI:10.1021/acs.oprd.9b00195
日期:2019.8.16
chemoselectivity and rate. The use of K2CO3 as the base enabled selective C–N coupling of aryl bromides over arylchlorides with 2–5 mol % Cu at 80–120 °C. With K3PO4 as the base, arylchlorides are capable of undergoing C–N coupling, though 5–10 mol % Cu is required at 120–130 °C. Members of the ligand family are straightforward to prepare in one step from 6-hydroxypicolinic acid and the corresponding
已经确定了6-羟基吡啶甲酸酰胺配体家族是Cu催化的杂芳基溴化物和氯化物与杂芳基伯胺的偶联的有效支撑配体。C–N偶联是在80–120°C的DMSO或环丁砜中,以2-10 mol%CuI和支持配体的K 2 CO 3或K 3 PO 4为碱进行的。发现碱的强度对化学选择性和速率有影响。使用K 2 CO 3作为碱,可以在80–120°C的条件下,以2–5 mol%的Cu在芳基氯上进行芳基溴的选择性C–N偶联。含K 3 PO 4作为基础,芳基氯化物能够进行C–N偶联,尽管在120–130°C下需要5–10 mol%的Cu。配体家族的成员可以直接一步一步由6-羟基吡啶甲酸和相应的苯胺制备。
Hybrid organic‐inorganic Cu(II) iminoisonicotine@TiO
<sub>2</sub>
@Fe
<sub>3</sub>
O
<sub>4</sub>
heterostructure as efficient catalyst for cross‐couplings
作者:Mohamed Shaker S. Adam、Farman Ullah、Mohamed M. Makhlouf
DOI:10.1111/jace.17098
日期:2020.8
immobilized coppercatalyst (CuL@TiO2@Fe3O4) shell‐shell‐core system. The structural analysis revealed that the catalyst system is composed of both agglomerated nanospheres and deformed nanorods. Both coppercatalysts, immobilized CuL@TiO2@Fe3O4 and un‐immobilized CuL were studied in heterogeneous and homogeneous catalysis, respectively, for Suzuki‐Miyaura (C–C) and Buchwald‐Hartwig (C–N) cross‐coupling reactions
通过与Cu(II)离子配位,(CuL @ TiO 2 @Fe 3 O 4)和不将(CuL)固定在TiO 2上,由Cu(II)离子配位,由新的三齿亚氨基异烟碱配体(HL)合成了两种新型单核铜(II)络合物催化剂。Fe 3 O 4包覆的纳米颗粒。配体背面的酯部分用于固定在Fe 3 O 4纳米颗粒上。配体和CuL络合物均通过使用其他光谱技术(核磁共振,红外,紫外可见光谱和质谱以及元素分析)进行了全面表征。使用不同的分析技术来确定固定化铜催化剂(CuL @ TiO 2 @Fe 3 O 4)壳-壳-核系统的结构特征和形态。结构分析表明,该催化剂体系由团聚的纳米球和变形的纳米棒组成。两种铜催化剂,固定化的CuL @ TiO 2 @Fe 3 O 4分别在Suzuki-Miyaura(CC)和Buchwald-Hartwig(CN)的各种杂芳基卤化物的交叉偶联反应的非均相和均相催化中研究了CuL和未固定的
Anticancer-Active <i>N</i>-Heteroaryl Amines Syntheses: Nucleophilic Amination of <i>N</i>-Heteroaryl Alkyl Ethers with Amines
作者:Xia Wang、Qiu-Xia Yang、Cheng-Yu Long、Yan Tan、Yi-Xin Qu、Min-Hui Su、Si-Jie Huang、Weihong Tan、Xue-Qiang Wang
DOI:10.1021/acs.orglett.9b01711
日期:2019.7.5
A mild amination protocol of N-heteroaryl alkyl ethers with various amines is described. This transformation is achieved by utilizing simple and readily available base as promoter via C–O bond cleavage, offering a new amination strategy to access several anticancer-active compounds. This work is highlighted by the excellent functional group compatibility, scalability, wide substrate scope, and easy
Rhodium-Catalyzed Synthesis of 2-Methylindoles via C–N Bond Cleavage of <i>N</i>-Allylbenzimidazole
作者:Pragati Biswal、Tanmayee Nanda、Namrata Prusty、Smruti Ranjan Mohanty、Ponneri C. Ravikumar
DOI:10.1021/acs.joc.2c03048
日期:2023.7.7
A rhodium-catalyzed oxidative C–H/N–H dehydrogenative [3 + 2] annulation strategy has been reported between anilines and N-allylbenzimidazole for the synthesis of 2-methylindole scaffolds. An N-allylbenzimidazole has been used as a 2C synthon for the synthesis of indole, and more importantly, this transformation involves the cleavage of the thermodynamically stable C–N bond of allylamine. Detailed