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aReaction conditions: 1a (0.2 mmol, 1 equiv), 2 (1.0 mmol, 5 equiv), MeCN (2 mL), anhydrous FeCl3 (10 mol %), room temperature around reaction flask was 35 °C (heating caused by the LED lamp.), 15 h. All yields are isolated. b1 mmol scale reaction (see Supporting Information, page S19). cTwenty-four hours.
