Rh(III)-catalyzed C–H alkylation of 2-arylbenzothiazoles with α-diazo esters
摘要:
The rhodium(III)-catalyzed ortho-C-H functionalization of 2-arylbenzo[d]thiazoles with alpha-diazo esters is described. This transformation provides the facile and efficient construction of C2-alkylated 2-arylbenzo[d]thiazoles in the absence of external oxidants, and releases benign N-2 gas as the only byproduct. (C) 2015 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Double C–S Bonds Formation via Different Paths: Synthesis of Benzothiazoles from N-Benzyl-2-iodoaniline and Potassium Sulfide
摘要:
A new, highly efficient procedure for the synthesis of benzothiazoles from easily available N-benzyl-2-iodoaniline and potassium sulfide has been developed. The results show copper-catalyzed double C-S bond formation via a traditional cross-coupling reaction and an oxidative cross-coupling reaction.
Cross-Dehydrogenative Coupling of Heterocyclic Scaffolds with Unfunctionalized Aroyl Surrogates by Palladium(II) Catalyzed C(sp<sup>2</sup>)-H Aroylation through Organocatalytic Dioxygen Activation
作者:Bhavin V. Pipaliya、Asit K. Chakraborti
DOI:10.1021/acs.joc.7b00226
日期:2017.4.7
carbonyl group of aryl aldehyde and the aryl methane. However, the ease of availability of aryl methanes makes them the most attractive as an aroyl source. A time dependent selective mono- and bis-aroylation can be achieved. The 1,3-diarylpyrimidines exhibited regioselective aroylation of the 2-phenyl moiety irrespective of the absence or presence of any substitutent (electronwithdrawing or electron donating)
通过NHPI的双氧激活,在Pd(II)催化的C(sp 2)-H活化过程中,生物相关的杂环支架与芳基甲烷的芳基化反应进行了脱氢偶联。质谱和基于1 H NMR的动力学同位素效应研究表明,CH键的活化是决定速率的步骤。自由基清除实验表明存在自由基途径。在1等分试样的反应混合物的1 H NMR和用2-氨基硫代苯酚原位捕集揭示芳基甲烷的需氧氧化过程中醛的形成。该反应对于芳酰基源和包括苯并噻唑,苯并恶唑,吡啶,喹喔啉,嘧啶和偶氮芳烃的导向基团的不同变化具有广泛的范围。发现苄基亚甲基部分是芳酰基碳的来源,最优选苄基醚部分,其次是芳基醛和芳基甲烷的羰基。但是,芳基甲烷的易得性使其成为芳酰基源最具吸引力。可以实现时间依赖性的选择性单-和双-芳基化。1 3-二芳基嘧啶表现出2-苯基部分的区域选择性芳酰基化,而与3-苯基部分中是否存在任何取代基(吸电子或供电子)无关。对于不对称的偶氮芳烃,在带有取代基的苯基部分中发生选择性芳酰基化。
Pd-Catalyzed Decarbonylative C−H Coupling of Azoles and Aromatic Esters
decarbonylative C−H coupling of azoles and aromaticesters by palladium catalysis is described. Our previously reported Ni‐catalyzed C−H coupling of azoles and aromaticesters has a significant drawback regarding the substrate scope. Herein, we employ palladium catalysis instead of nickel, resulting in a broader substrate scope in terms of azoles and aromaticesters.
Direct Oxygenation of C–H Bonds through Photoredox and Palladium Catalysis
作者:Sk. Sheriff Shah、Maniklal Shee、Amit Kumar Singh、Amrita Paul、N. D. Pradeep Singh
DOI:10.1021/acs.joc.9b03197
日期:2020.3.6
This report presents the oxygenation of C-H bonds via the merger of photocatalysis and Pd catalysis. Herein, we describe the utilization of a photocatalyst to oxidize an organopalladium(II) intermediate to high-valent PdIII or PdIV intermediates, which promotes the formation of C-O bonds. The demonstrated method works efficiently with various directing groups, such as oxime ether and benzothiazole
Iodine-catalyzed convergent aerobic dehydro-aromatization toward benzazoles and benzazines
作者:Xiaolong Tuo、Shanping Chen、Pingyu Jiang、Penghui Ni、Xiaodong Wang、Guo-Jun Deng
DOI:10.1039/c9ra10964a
日期:——
has been developed, providing straightforward and efficient access to various benzoazoles and benzoazines. The present transition-metal-free protocol enables the dehydro-aromatization of tetrahydrobenzazoles and tetrahydroquinolines with molecularoxygen as the green oxidant, along with some other N-heterocycles. Hence, a broad range of heteroaromatic compounds are generated in moderate to good yields
NOVEL ORGANIC HETEROCYCLIC COMPOUND AND LIGHT-EMITTING DEVICE COMPRISING SAME
申请人:SFC CO., LTD.
公开号:US20180072753A1
公开(公告)日:2018-03-15
The present invention relates to an organic light-emitting compound represented by [Chemical Formula A] and an organic light-emitting device. In Chemical Formula, A, X, Y, Z, and the substituents R
1
to R
8
, and R
11
to R
20
are as defined in the specification.