Reaction scope for the formation of chromeno[3,4-c]pyrroles 2^a.

^aReaction conditions: 1 (0.1 mmol), Cu(CH₃CN)₄PF₆ (0.01 mmol), NaBAr^F₄ (0.012 mmol), (±)-BINAP (0.012 mmol), DCE (2 mL), 40 °C, 12 h, in vials; yields are for the isolated products.

^bFormed from ynamide substrate 1ag. Ts = p-toluenesulfonyl. MBS = 4-methoxybenzenesulfonyl.