Three-Component One-Pot Synthesis of Unsymmetrical Diarylalkynes by Thermocontrolled Sequential Sonogashira Reactions Using Potassium Ethynyltrifluoroborate
作者:Taejung Kim、Kyu Hyuk Jeong、Youngseok Kim、Taesub Noh、Jaeyoung Choi、Jungyeob Ham
DOI:10.1002/ejoc.201700110
日期:2017.5.3
Sonogashira reactions with potassium ethynyltrifluoroborate and two different reactive aryl halides. The one-pot procedure was initiated by the palladium/copper-catalyzed Sonogashira coupling of potassium ethynyltrifluoroborate to an aryliodide or electron-deficient aryl bromide at 40 °C. Following a subsequent deboronative Sonogashira reaction of the in situ generated potassium (arylethynyl)trifluoroborate
Visible Light‐Catalyzed Decarboxylative Alkynylation of Arenediazonium Salts with Alkynyl Carboxylic Acids: Direct Access to Aryl Alkynes by Organic Photoredox Catalysis
salts have been utilized as the aryl radical source to couple alkynyl carboxylic acids to feature the decarboxylative arylation. A wide range of substrates are amenable to this protocol with broad functional group tolerance, and diversely‐functionalized aryl alkynes could be synthesized undermild, neutral and transition metal‐free reaction conditions using visiblelight irradiation. Alongside synthetic
Palladium(II) Chloride Complexes of N,N′-Disubstituted Imidazole-2-thiones: Syntheses, Structures, and Catalytic Performances in Suzuki–Miyaura and Sonogashira Coupling Reactions
作者:Li-Ming Zhang、Hai-Yan Li、Hong-Xi Li、David James Young、Yong Wang、Jian-Ping Lang
DOI:10.1021/acs.inorgchem.7b01616
日期:2017.9.18
Reactions of PdCl2 with 2 equiv of N,N′-disubstituted-imidazole-2-thiones R1R2C3N2S (R1 = R2 = Me (1a), iPr (1b), Cy (1c), C6Me3H2 (1d); R1 = Me, R2 = Ph (1e)) under the different conditions afford five mononuclear complexes trans-[(R1R2C3N2S)2PdCl2] (R1 = R2 = Me (2a), iPr (2b), Cy (2c), C6Me3H2 (2d); R1 = Me, R2 = Ph (2e)) and five binuclear Pd(II) complexes [(PdCl2)μ-(R1R2C3N2S)}]2 (R1 = R2 = Me
PdCl 2与2当量的N,N'-二取代-咪唑-2-硫酮R 1 R 2 C 3 N 2 S(R 1 = R 2 = Me(1a),i Pr(1b),Cy(1c),C 6 Me 3 H 2(1d); R 1 = Me,R 2 = Ph(1e))在不同条件下可得到5个单核配合物反式-[(R 1 R 2 C 3 N 2 S)2 PdCl 2 ](R 1 = R 2 = Me(2a),i Pr(2b),Cy(2c),C 6 Me 3 H 2(2d); R 1 = Me,R 2 = Ph(2e))和五个双核Pd(II)络合物[(PdCl 2)μ-(R 1 R 2 C 3 N 2 S)}] 2(R 1 = R 2 = Me(3a),i Pr(3b),Cy(3c),C 6 Me 3 H 2(3d); R 1 = Me,R 2 = Ph(3e))。通过在回流的MeOH中添加等摩尔的PdCl 2,可以轻松将络合物2a
Palladium-catalyzed decarboxylative coupling reaction with alkynyl carboxylic acids and arylsiloxanes
作者:Jisun Jang、Gabriel Charles Edwin Raja、Ju-Hyeon Lee、Yujeong Son、Jimin Kim、Sunwoo Lee
DOI:10.1016/j.tetlet.2016.08.095
日期:2016.10
A decarboxylative coupling reaction for alkynyl carboxylic acids and arylsiloxanes was developed using a palladium catalyst. This method provided the desired coupled products in moderate to good yields by reacting the alkynyl carboxylic acids and arylsiloxanes with Pd(dba)2 (1.0 mol %), 1,1-bis(diphenylphosphino)methane (1.0 mol %), and AgF2 (2.0 equiv) at 60 °C for 6 h.
The catalytic activity of two CNC palladium pincer complexes is evaluated in two fundamental CC bond‐forming reactions: MizorokiHeck and Sonogashira cross‐couplings. After several optimization attempts and a brief comparison with a PCNpincercatalyst, a number of arylated alkenes and diarylethynes are synthesized by procedures based on the catalytic use of the above mentioned CNC Pd pincers in H2O