SCHEDULED MAINTENANCE:
Quinoline-5,8-dione 5 reacted with 1-methylpyrrole in acetic acid to give 6- and 7-(1-methylpyrrol-2-yl)quinoline-5,8-diones, one of which (6-isomer) showed remarkable metallochromic behaviour. Selective synthesis of the 6-isomer from 5 was achieved by addition of metal salts.
K. Yoshida, Y. Ueno, M. Suzuki, Y. Yoshida and Y. Kubo, J. Chem. Soc., Perkin Trans. 1, 1992, 2713 DOI: 10.1039/P19920002713
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