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A Pre-modification, General conditions: 1 (1.2 mmol), 2 (1.0 mmol), 3 (1.0 mmol), I2 (1.0 mmol), DTBP (2.0 mmol), DMSO (5.0 mL, c = 0.2 M), 100 °C, 4 h, isolated yields. B Gram-scale experiments. C Late-modification. D Transformations of 6i.
