Scheme 2.
Synthesis of bivalent β-carboline-3-carboxylic acid derivatives (6a-6f, 6g-6l, 6m-6r, and 6s-6x). Reagents and conditions: (a) THF/CH3OH, OH–, r.t.; (b) DMF, K2CO3, BrR2Br, heat.
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