Palladium-Catalyzed Cascade Process Consisting of Isocyanide Insertion and Benzylic C(sp(3))-H Activation: Concise Synthesis of Indole Derivatives |
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Authors: | Takeshi Nanjo Chihiro Tsukano Yoshiji Takemoto |
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Institution: | Graduate School of Pharmaceutical Sciences, Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501, Japan. |
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Abstract: | Synthesis of the indole skeleton was achieved using a Pd-catalyzed cascade process consisting of isocyanide insertion and benzylic C(sp(3))-H activation. It was found that slow addition of isocyanide is effective for reducing the amount of catalyst needed and Ad(2)P(n)Bu is a good ligand for C(sp(3))-H activation. The construction of the tetracyclic carbazole skeleton was also achieved by a Pd-catalyzed domino reaction incorporating alkyne insertion. |
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