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Organocatalytic synthesis of 3,3′-bisindolines 3-12 from 3-fluorooxindoles and isatylidene malononitriles. Reaction conditions: 0.2 mmol of isatylidene malononitrile and 0.2 mmol of 3-fluorooxindole in 0.5 mL of solvent, 10-20 mol% of catalyst, 25 °C. See SI for details.
