Palladium-catalyzed C-H homocoupling of bromothiophene derivatives and synthetic application to well-defined oligothiophenes |
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Authors: | Takahashi Masabumi Masui Kentaro Sekiguchi Hiroki Kobayashi Nobuhiko Mori Atsunori Funahashi Masahiro Tamaoki Nobuyuki |
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Affiliation: | Chemical Resources Laboratory, Tokyo Institute of Technology, R1-4 4259 Nagatsuta, Yokohama 226-8503, Japan. |
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Abstract: | Synthesis of oligothiophenes of well-defined structures that possess 2-8 thiophene units is performed with a new synthetic strategy involving C-H homocoupling of bromothiophenes and cross-coupling with organostannanes. Tolerance of the carbon-bromine bond to the palladium-catalyzed C-H homocoupling results in oligothiophenes bearing C-Br bonds at the terminal thiophene rings, which allow further transformation by the catalysis of a transition-metal complex. |
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