1. Molina, P.; Vilaplana, M. J. Synthesis, 1994, 1197.
2. Synthesis and analgesic evaluation of some 1,1-disubstituted 3-carboxy-4-phenyl-1,2,3,4-tetrahydro-β-carboline derivatives
3. (2) 1H NMR (CDCl3 300 MHz) δ ppm 8.25 (NH, s, 1H), 7.83 (H5, dd, 7 Hz, 1.8 Hz, 1H), 7.52 (H3′, dd, 9 Hz, 2 Hz, 1H), 7.41 (H6′, dd, 9 Hz, 1.7 Hz, 1H), 7.4–7.12 (m, 4H), 7.33 (H8, dd, 7.2 Hz, 1.6 Hz, 1H), 5.65 (H1, s, 1H), 3.15 (H3, m, 2H), 2.87 (H4, m, 2H); 13C NMR (CDCl3 75 MHz) δ ppm 149.8, 136.4, 135.9, 132.9, 132.2, 131.2, 128.6, 126.9, 124.2, 122.0, 119.5,118.3, 111.1, 110.9, 52.0, 41.6, 22.1.
4. Julino, M.; Stevens, M.F.G. J. Chem. Soc. Perkin 1 1998, 1677.
5. Synthesis of new azino fused benzimidazolium salts. a new family of DNA intercalating agents. I