Oligo-p-phenylenes have proven to be versatile building blocks for the generation of self-assembled nanoaggregates via vapour deposition on solid supports whose optical properties and morphologies can be influenced by the introduction of functional groups. These aggregates show strong polarized luminescence and they have been demonstrated to have wave-guiding, lasing and even non-linear optical properties (e.g., frequency doubling) when the molecular building blocks are suitably functionalized. Thus, there is a demand for the synthesis of further functionalised p-phenylenes because similar properties can be expected from derivatives incorporating heteroaryl groups in the oligoarylene scaffold such as thiophenes, pyridines or carbazole units. The synthesis of such derivatives using a reliable Suzuki cross-coupling strategy is presented here.
Light‐Induced Gold‐Catalyzed Hiyama Arylation: A Coupling Access to Biarylboronates
作者:Jin Xie、Kohei Sekine、Sina Witzel、Petra Krämer、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201806427
日期:2018.12.17
photochemical gold‐catalyzed chemo‐selective Hiyama arylation of B,Si bifunctionalized reagents with diazonium salts, which is orthogonal to common strategies and therefore a unique tool for synthesis of valuable biarylboronates. With this new methodology a wide array of diversely functionalized sp2‐ and sp3‐hybridized biarylboronates were obtained. Notably, the synergism of gold catalysis with copper catalysis
Photoinduced Deaminative Borylation of Unreactive Aromatic Amines Enhanced by CO<sub>2</sub>
作者:Akira Shiozuka、Kohei Sekine、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.1c01503
日期:2021.6.18
Herein, direct unreactive C–N borylation of aromatic amines by a photocatalyst was achieved. The C–N borylation of aromatic amines with bis(pinacolato)diboron (B2pin2) proceeded using a pyrene catalyst under light irradiation to afford desired borylated products and aminoborane as a byproduct. The yield of the borylated product improved under a CO2 atmosphere which probably reduced the inhibitory effect