An efficient phosphine-free direct C–Harylation of thiophenes at the α-position has been developed at low catalyst loading of bis(alkoxo)palladium complex (Cat.I, 0.1–0.2 mol %). The developed synthetic method can be applied to the synthesis of α-aryl/heteroaryl thiophenes from aryl or heteroaryl bromides in good to excellent yields and is compatible with the substrates bearing electron-donating or
With good to excellent yields, a series of mono- or diheteroaryl compounds were synthesizedviathe palladacycle-catalyzed Suzuki–Miyaura reaction of variousN-methyliminodiacetic acid (MIDA) boronates with aryl/heteroaryl halides in EtOH/H2O or H2O.
Transient‐Ligand‐Enabled
<i>ortho</i>
‐Arylation of Five‐Membered Heterocycles: Facile Access to Mechanochromic Materials
作者:Bijin Li、Kapileswar Seth、Ben Niu、Lei Pan、Huiwen Yang、Haibo Ge
DOI:10.1002/anie.201713357
日期:2018.3.19
example of a direct arylation of heteroarenes by a transient‐ligand‐directed strategy without the need to construct and deconstruct the directing group. A wide range of heteroarenes undergoes the coupling with diverse aryl iodides to assemble a large library of highly selective and functionalized 3‐arylthiophene‐2‐carbaldehydes. This route provides an opportunity to rapidly access new mechanofluorochromic
No Fe‐ar: Iron catalyzes an imine‐directed CH bond activation to introduce an ortho‐aryl group to an acetophenone‐derived imine using a diarylzinc reagent (see scheme), whereas palladium catalyzes the conventional substitution reaction . The title reaction features mild and selective CH bond activation in the presence of aryl bromide, chloride, or sulfonate groups, and 1,2‐dichloroisobutane is essential
Iron-Catalyzed Arylation of Heterocycles via Directed C–H Bond Activation
作者:John J. Sirois、Riley Davis、Brenton DeBoef
DOI:10.1021/ol403634b
日期:2014.2.7
The iron-catalyzedarylation of aromatic heterocycles, such as pyridines, thiophenes, and furans, has been achieved. The use of an imine directing group allowed for the ortho functionalization of these heterocycles with complete conversion in 15 min at 0 °C. Yields up to 88% were observed in the synthesis of 15 heterocyclic biaryls.