P,N,N-Pincer nickel-catalyzed cross-coupling of aryl fluorides and chlorides
作者:Dan Wu、Zhong-Xia Wang
DOI:10.1039/c4ob01041h
日期:——
were synthesized and their catalysis toward the Kumada or Negishi cross-coupling reaction of aryl fluorides and chlorides was evaluated. Complex 3a effectively catalyzes the cross-coupling of (hetero)aryl fluorides with aryl Grignard reagents at room temperature. Complex 3a also catalyzes the cross-coupling of (hetero)arylchlorides and arylzinc reagents at 80 °C with low catalyst loadings and good
P,N,N-镍镍配合物[Ni(Cl)N(2-R 2 PC 6 H 4)(2'-Me 2 NC 6 H 4)}](R = Ph,3a ; R = Pr i,合成了3b; R = Cy,3c),并评估了它们对芳基氟化物和氯化物的Kumada或Negishi交叉偶联反应的催化作用。在室温下,配合物3a有效催化(杂)芳基氟化物与芳基格氏试剂的交叉偶联。复杂3a 它还在低催化剂负载和良好的官能团相容性下,于80°C催化(杂)芳基氯和芳基锌试剂的交叉偶联。
Cobalt-Catalyzed Cross-Coupling Reactions of Heterocyclic Chlorides with Arylmagnesium Halides and of Polyfunctionalized Arylcopper Reagents with Aryl Bromides, Chlorides, Fluorides and Tosylates
A range of aromatic organocopper or organomagnesium compounds undergo smooth cross-coupling reactions with aryl bromides, chlorides, fluorides and tosylates, leading to polyfunctionalized aromatics or heterocycles in the presence of cobalt salts (5-7.5 mol%) as catalysts. Very mild reaction conditions are needed and, in the case of cross-coupling with organocopper compounds, Bu4NI (1 equiv) and 4-fluorostyrene (20 mol%) are essential as promoters for successful couplings.
Nickel-Catalyzed Cross-Coupling of Aryl Fluorides and Organozinc Reagents
作者:Feng Zhu、Zhong-Xia Wang
DOI:10.1021/jo500619f
日期:2014.5.16
Ni(PCy3)2Cl2 was demonstrated to effectively catalyze cross-coupling of aryl fluorides and organozincreagents. Both electron-poor and -rich aryl fluorides can react effectively with nucleophiles including aryl-, methyl-, and benzylzinc chlorides. A wide range of substituents and functional groups are tolerated. In the presence of a directing group, PhC(O), the reaction is selective for cleavage of
6-Arylphenanthridines from Aryl <i>o</i>
-Biaryl Ketones with 1,1,1,3,3,3-Hexamethyldisilazane and Molecular Iodine
作者:Eiji Kobayashi、Atsushi Kishi、Hideo Togo
DOI:10.1002/ejoc.201901278
日期:2019.11.30
Aryl biaryl ketones were transformed into 6‐arylphenanthridines efficiently by the reaction with 1,1,1,3,3,3‐hexamethyldisilazane in the presence of Sc(OTf)3 in toluene, followed by removal of the solvent, and the subsequent reaction with molecular iodine and K2CO3 in a mixture of THF and methanol.
在甲苯中Sc(OTf)3存在下,通过与1,1,1,1,3,3,3-六甲基二硅氮烷反应,将芳基联芳基酮有效地转化为6-芳基菲啶,然后除去溶剂,然后进行后续反应分子碘和THF和甲醇的混合物中的K 2 CO 3。
Synthesis, aggregation-enhanced emission, polymorphism and piezochromism of TPE-cored foldamers with through-space conjugation