The comparison of the current method with previous reports in the arylation of benzoxazole.

Entry	Catalyst	Reagent	Condition	Yield (%)
1	FeSO4 (0.2 equiv.), H2O/diglyme/O2		150 °C, 20 h	70 (ref. 31)
2	I2 (2 equiv.), PhCl, DMF		130 °C, 30 h	75 (ref. 30)
3	[Pd(π-allyl)Cl]2 (0.1 equiv.), PCy3, NaOtBu (2 equiv.), DMF		120 °C, 12 h	43 (ref. 7)
4	CuCN(PPh3)2 (10 mol%), PPh3, Cs2CO3, pivalonitrile		Reflux, 24 h	85 (ref. 28)
5	Ni(COD)2 (0.1 equiv.), dcype (0.2 equiv.), Cs2CO3 (1.5 equiv.), p-xylene		140 °C, 22 h	91 (ref. 29)
6	Current work: [ZnCl2][ethylene glycol]4 (5 mol%), solvent-free		120 °C, 6 h	95