Selective palladium-catalysed arylation of 2,6-dibromopyridine using N-heterocyclic carbene ligands
作者:D. Prajapati、C. Schulzke、M. K. Kindermann、A. R. Kapdi
DOI:10.1039/c5ra10561g
日期:——
A selective palladium-catalysed arylation of 2,6-dibromopyridine has been developed by employing N-heterocyclic carbene ligands. Selective mono-arylation was performed in water/acetonitrile solvent system at ambient temperature with catalyst loading of 0.1 mol%. This reaction was also found to proceed smoothly in water although at a slightly elevated temperature of 80 °C. 2,6-Disubstituted and diversely
Dichloro-Bis(aminophosphine) Complexes of Palladium: Highly Convenient, Reliable and Extremely Active Suzuki-Miyaura Catalysts with Excellent Functional Group Tolerance
作者:Jeanne L. Bolliger、Christian M. Frech
DOI:10.1002/chem.200903309
日期:2010.4.6
systems, is a highlyconvenient, reliable, and extremelyactive Suzuki catalyst with excellentfunctionalgrouptolerance that enables the quantitative coupling of a wide variety of activated, nonactivated, and deactivated and/or sterically hindered functionalized and heterocyclic aryl and benzyl bromides with only a slight excess (1.1–1.2 equiv) of arylboronic acid at 80 °C in the presence of 0.2 mol % of
Cyclometalated Pt Complexes of CNC Pincer Ligands: Luminescence and Cytotoxic Evaluation
作者:Simon Garbe、Maren Krause、Annika Klimpel、Ines Neundorf、Petra Lippmann、Ingo Ott、Dana Brünink、Cristian A. Strassert、Nikos L. Doltsinis、Axel Klein
DOI:10.1021/acs.organomet.0c00015
日期:2020.3.9
in line with the absorption energies. While the 2,6-diphenylpyridine complexes [Pt(CNC)(DMSO)] show no luminescence at ambient temperature in solution, the fused dba, db(ph)a, and bzqph derivatives are efficient triplet emitters at ambient temperature with emission wavelengths in the region 575–600 nm and quantum yields ranging from 7 to 23%. Vibrationally resolved emission spectra calculated in the
在我们尝试开发用于双功能靶向抑制剂或光动力疗法,诊断学和生物成像试剂的环金属化Pt(II)配合物的框架中,一系列双环金属化Pt(II)配合物[Pt(CNC)(L)]( L = DMSO,MeCN),其中包含各种(CNC)2–合成了基于2,6-二苯基吡啶的配体,并对其进行了分析和光谱表征,重点是它们的电化学,发光和抗增殖特性。电化学实验和紫外可见吸收光谱表明,与DFT计算一致,以配体为中心的LUMO和以金属为中心的HOMO。辅助苯基延伸至萘基核和中心的4-苯基吡啶基团而不是吡啶导致长波吸收带在420至440 nm范围内发生红移,后者的变化更为明显。稠合杂环数控系统DBA(H的配合物2 DBA =二苯并[ c ^,ħ ]吖啶),DB(PH)一(H 2分贝(PH)A = 7苯基二苯[ C ^,h ] ac啶)和bzqph(HbzqphH = 2-苯基苯并[ h ]喹啉)在500-530 nm范围
Triarylbismuthanes as Threefold Aryl-Transfer Reagents in Regioselective Cross-Coupling Reactions with Bromopyridines and Quinolines
作者:Maddali L. N. Rao、Ritesh J. Dhanorkar
DOI:10.1002/ejoc.201402455
日期:2014.8
Cross-coupling studies using bromopyridines and bromoquinolines with triarylbismuths as threefold coupling reagents in substoichiometric amounts under Pd-catalysed conditions are disclosed. The reactivity was high with both mono- and dibromopyridyl substrates, and mono- and bis-couplings were carried out regioselectively. A library of monoaryl and diaryl pyridines was formed in high yields. A one-pot
The 1,3-Diaminobenzene-Derived Aminophosphine Palladium Pincer Complex {C6H3[NHP(piperidinyl)2]2Pd(Cl)} - A Highly Active Suzuki-Miyaura Catalyst with Excellent Functional Group Tolerance
作者:Jeanne L. Bolliger、Christian M. Frech
DOI:10.1002/adsc.200900848
日期:——
The rapidly prepared 1,3‐diaminobenzene‐derived aminophosphine pincer complex C6H3[NHP(piperidinyl)2]2Pd(Cl)} (1) is an effective Suzuki catalyst with excellentfunctionalgrouptolerance. Side‐product formations, such as homocoupling, debromation or protodeboration have only rarely been detected and if so, were in all cases below the 5% level. The presented reaction protocol is universally applicable
快速制备的1,3-二氨基苯衍生的氨基膦钳形配合物C 6 H 3 [NHP(哌啶基)2 ] 2 Pd(Cl)}(1)是一种有效的Suzuki催化剂,具有出色的官能团耐受性。仅很少检测到副产物形成,例如均偶联,去溴化或原去硼,如果这样,在所有情况下均低于5%的水平。提出的反应方案是普遍适用的。实验观察表明,钯纳米颗粒的催化活性形式1。