Effect of solvent source on the yield of 3a.

Entry	Solventa	Yieldb (%)
1	n-Hexane	12
2	Toluene	51
3	Water	56
4	2-Propanol	0
5	Acetonitrile	0
6	1,4-Dioxane	0
7	DMF	0
8	THF	0
9	DMSO	0
10	Ethanol	Trace

^aReaction conditions: TLIM (50 mg), 4-chlorobenzaldehyde (1 mmol), 1H-indole (2 mmol), solvent (5 mL), 45 °C, 18 h.

^bHPLC yield.