Scheme 2. Scope of aromatic nucleophiles. [a] Reactions were performed with pyrrolidine (0.33 mmol), quinone monoacetal 2 (0.3 mmol), nucleophile (0.45 mmol), and DABCO (0.06 mmol) at 60 °C in toluene (conc. = 0.5 M). [b] 4 Å molecular sieve (100 mg) was added. [c] Reactions were performed with pyrrolidine (1.5 mmol), quinone monoacetal 2 (0.3 mmol), nucleophile (1.5 mmol), and DABCO (0.06 mmol) at 60 °C in toluene. [d] 15 mol% of CuI was added and the reaction was performed at 80 °C.