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Somei‐Michael coupling attempts. Reagents and conditions: a) General conditions of Somei reaction: 3 (1.2 equiv.), NaH (1.1 equiv.), 2 (1 equiv.), DMF, 0 °C to r. t., 12 h; b) NH4Cl, 13 a (65 %), 13 b (53 %), for 3c: 14 detected instead of biindole; c) All bromination attempts modify only C‐3 in 13 a to form 13 b, when NBS in THF are used, C‐6’ is then brominated to form 15.
