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Herein, we demonstrate the design, synthesis, biophysical properties, and preliminary biological evaluation of 6-substituted indenoisoquinolines as a new class of G-quadruplex stabilizing small molecule ligands. We have synthesized 6-substituted indenoisoquinolines 1a-e in two steps from commercially available starting materials with excellent yields. The G-quadruplex stabilization potential of indenoisoquinolines 1a-e was evaluated by fluorescence resonance energy transfer-melting analysis, which showed that indenoisoquinolines show a high level of stabilization of various G-quadruplex DNA structures. Indenoisoquinolines demonstrated potent inhibition of cell growth in the GIST882 patient-derived gastrointestinal stromal tumor cell line, accompanied by inhibition of both c-Kit transcription and KIT oncoprotein levels.

Targeting the c-Kit Promoter G-quadruplexes with 6-Substituted Indenoisoquinolines