Preparation of Vinyl Arenes by Nickel-Catalyzed Reductive Coupling of Aryl Halides with Vinyl Bromides
作者:Jiandong Liu、Qinghua Ren、Xinghua Zhang、Hegui Gong
DOI:10.1002/anie.201607959
日期:2016.12.12
This work emphasizes the synthesis of substituted vinyl arenes by reductive coupling of arylhalides with vinyl bromides under mild and easy‐to‐operate nickel‐catalyzed reaction conditions. A broad range of arylhalides, including heteroaromatics, and vinyl bromides were employed to yielding products in moderate to excellent yields with high functional‐group tolerance. The nickel‐catalytic system displays
An efficient synthesis of quinolizinium salts from 2-vinylpyridines and alkynes via Rh(III) or Ru(II)-catalyzed CâH activation and annulation reaction is described. A possible mechanism involving pyridine assisted vinylic ortho-CâH activation, alkyne insertion and reductive elimination is proposed.
Chemoselective, osmium-free, dihydroxylation/oxidative cleavage of heteroaryl isoprenes by a contemporary Malaprade reaction
作者:Zachary Z. Gulledge、Connor C. Pinson、Alexander M. Stovall、Fortune O. Dzeagu、Jesse D. Carrick
DOI:10.1039/d2ob01643e
日期:——
oxidative-cleavage strategies, frequently result in diminished performance over carbon-based arenes. In this work we present the development and application of an oxidative cleavage reaction of various pyridinyl isoprenes towards accessing the downstream methyl ketone for utilization in advanced cyclizations for the preparation of soft-N-donor complexant scaffolds. This efficient protocol parallels the principles
甲基酮是构建先进杂芳基支架和系统的核心合成构件。包括氧化环化策略在内的反应通常取决于对这种普遍存在的部分的有效访问。在芳烃的背景下,利用马尔科夫尼科夫水合/氧化或 C-C π 键的氧化裂解的标准方法通常可以提供令人满意的性能。然而,当底物包含缺电子杂芳基核心时,传统的 Malaprade 反应和相关的氧化裂解策略通常会导致性能低于碳基芳烃。在这项工作中,我们介绍了各种吡啶基异戊二烯的氧化裂解反应的开发和应用,以获取下游甲基酮,用于高级环化以制备软 N 供体络合剂支架。这种高效的协议通过交换 KMnO 与绿色化学的原理平行4用于有毒的 OsO 4,并为最终用户提供了一种高效、更环保的选择,使用高锰酸钾和过碘酸钠作为协同有效的氧化裂解系统,在一小时的反应时间内获得杂芳基甲基酮。广泛的底物范围定义了获得简单和先进的杂芳基甲基酮的途径。本文描述了方法开发、优化、底物范围、初步机制观察和放大反应。
Plurality of host materials and an organic electroluminescence device comprising the same
申请人:Rohm and Haas Electronic Materials Korea Ltd.
公开号:US11130747B2
公开(公告)日:2021-09-28
The present invention relates to a plurality of host materials and an organic electroluminescent device comprising the same. By comprising a specific combination of a plurality of host compounds, the organic electroluminescent device according to the present invention provides high efficiency and long lifespan.
Palladium-catalyzed alkenyl C–H bond sulfonylation reaction using organosulfonyl chlorides
作者:Yun-He Xu、Min Wang、Ping Lu、Teck-Peng Loh
DOI:10.1016/j.tet.2013.01.071
日期:2013.6
A Pd-catalyzed alkenyl C-H bond direct sulfonylation of vinyl pyridine and enamides was developed. Various arylsulfonyl chlorides were tested in this reaction and the desired products were obtained in good yields. Moreover, the alkyl sulfonyl chloride could also be used though the yield was lower. A possible Pd(II)/Pd(IV) catalytic pathway involved in this coupling reaction was proposed. (C) 2013 Elsevier Ltd. All rights reserved.