One-pot access to indolo[2,3-b]quinolines by electrophile-triggered cross-amination/Friedel-Crafts alkylation of indoles with 1-(2-tosylaminophenyl)ketones |
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Authors: | Ali Shaukat Li Ying-Xiu Anwar Saeed Yang Fang Chen Zi-Sheng Liang Yong-Min |
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Institution: | State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Chinese Academy of Science, Lanzhou 730000, PR China. |
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Abstract: | Activation of C2 and C3 of indoles by molecular iodine (I(2)) and base followed by in situ reaction with 1-(2-tosylaminophenyl)ketones or 2-tosylaminobenzaldehyde can afford highly substituted indolo(2,3-b)quinolines in moderate to excellent yields (up to 99%). The reaction provides a metal-free selective difunctionalization of indoles. The synthetic potential of the protocol has been illustrated by the synthesis of neocryptolepine and its 11-methyl analogue. |
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