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Substrate scope of amines 2. Reagents and conditions: 1a (0.5 mmol), 2 (1.2 equiv), ZnCl2 (5 mol %), CH2Cl2 (5.0 mL), rt. aReflux. bDCE, reflux. cZn(OTf)2 (5 mol %), n-butylamine (5.0 equiv), DCE, reflux. dp-TsOH·H2O (5 mol %), PhNH2 (5.0 equiv), CH2Cl2, rt.
