Synthesis of benzofuran and indole derivatives via domino Sonogashira coupling/cyclization reactions catalyzed by 2a/2b^a.

Entry	2-Iodoarenes	Alkynes	Product	Yieldb (%)
				2a	2b
1				83	87
2				80	85
3				68	71
4				76	83
5				71	77
6				64	65
7				63	65
8				65	57
9				48	53
10				35	39
11				46	49
12				40	38
13				34	38
14				39	37

^aReaction conditions: 2-iodoarene derivative (0.50 mmol), alkyne (0.60 mmol), 2.0 mol% of 2a or 2b, K₃PO₄ (1.00 mmol), DMSO (2 mL), 90 °C, 10 h.

^bIsolated yield.