通过将不同长度的正烷基链从甲基调整为辛基,合成了一系列咔唑酰胺衍生物(CAC- N,N= 1–8)。它们的光物理行为高度依赖于它们的烷基链的奇偶校验。也就是说,具有偶数烷基链的化合物表现出有效的机械发光(ML)和强室温磷光(RTP),然而,在奇数对应物中没有观察到 ML 和较差的 RTP。为了让结果更清晰,实验室合成了重要的起始原料咔唑,从中重新合成了上述八种咔唑酰胺衍生物进行比较。尽管 RTP 特性受到商业咔唑中杂质的干扰,但 ML 特性保持不变。单晶分析表明,通过氢键相互作用,在偶数和奇数 CAC 晶体中分别形成了交联网络和孤立的二聚体,这应该解释奇偶交替 ML 现象。此外,通过在 CAC-8 的 ML 基质中掺杂各种有机染料,实现了从蓝色到红色的多色 ML。据我们所知,这项工作是首次观察到 ML 属性中的奇偶效应。
Palladium-Catalyzed [3+3] Annulation between Diarylamines and α,β-Unsaturated Acids through CH Activation: Direct Access to 4-Substituted 2-Quinolinones
作者:Rajesh Kancherla、Togati Naveen、Debabrata Maiti
DOI:10.1002/chem.201500774
日期:2015.6.1
A CHactivation strategy has been successfully employed for the high‐yielding synthesis of a diverse array of 4‐substituted2‐quinolinone species by a palladium‐catalyzed dehydrogenative coupling involving diarylamines. This intermolecular annulation approach incorporates readily available α,β‐unsaturated carboxylic acids as the couplingpartner by suppressing the facile decarboxylation. Based on
AC ħ激活策略已被成功地用于通过涉及二芳基胺钯催化脱氢偶联高产合成4-取代的2-喹啉酮物种的多样性阵列的。这种分子间环化方法通过抑制容易的脱羧作用,结合了易于获得的α,β-不饱和羧酸作为偶联伴侣。在初步的机理研究的基础上,提出了一个反应顺序,包括邻,π-配位,β-迁移插入和β-氢化物消除。
Expedited Palladium-Catalyzed Amination of Aryl Nonaflates through the Use of Microwave-Irradiation and Soluble Organic Amine Bases
作者:Rachel E. Tundel、Kevin W. Anderson、Stephen L. Buchwald
DOI:10.1021/jo052131u
日期:2006.1.1
Microwave-assisted, palladium-catalyzed C−N bond-forming reactions with aryl/heteroaryl nonaflates and aminesusing the soluble aminebases DBU (1,8-diazabicyclo[5.4.0]undec-7-ene) or MTBD (7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene) and ligands (1−3) resulted in good to excellent yields (71−99%) of arylamines in short reaction times (1−45 min).
Supramolecular Scaffolds and Methods of Making the Same
申请人:Becker Daniel P.
公开号:US20100041880A1
公开(公告)日:2010-02-18
Tribenzo-1,4,7-triazacyclononane and derivatives thereof having a formula (I) are disclosed. Methods of making tribenzo-1,4,7-triazacyclononane and related compounds also are disclosed.
Iodine(III)-mediated synthesis of 4-iodo-N-phenylaniline from iodobenzene has been achieved, and the reaction can proceed under mild conditions. A variety of functional groups were well tolerated, providing the corresponding products in moderate to good yields. The remaining iodine group provides an effective platform for converting the products into several valuable asymmetric diphenylamines. Most
Reductive Molybdenum-Catalyzed Direct Amination of Boronic Acids with Nitro Compounds
作者:Samuel Suárez-Pantiga、Raquel Hernández-Ruiz、Cintia Virumbrales、María R. Pedrosa、Roberto Sanz
DOI:10.1002/anie.201812806
日期:2019.2.11
The synthesis of aromatic amines is of utmost importance in a wide range of chemical contexts. We report a direct amination of boronic acids with nitro compounds to yield (hetero)aryl amines. The novel combination of a dioxomolybdenum(VI) catalyst and triphenylphosphine as inexpensive reductant has revealed to be decisive to achieve this new C−N coupling. Our methodology has proven to be scalable,