The scope of arylation of benzoxazoles with aromatic aldehydes.

Entry	Product	Condition	Yielda (%)
1		120 °C, 6 h	95 (94)b
2		120 °C, 5 h	93
3		120 °C, 5 h	94
4		120 °C, 4 h	95
5		140 °C, 6 h	75
6		120 °C, 4 h	80
7		120 °C, 4 h	92
8		120 °C, 5 h	70
9		120 °C, 5 h	90
10		120 °C, 5 h	72
11		120 °C, 4 h	90
12		120 °C, 6 h	93
13		120 °C, 6 h	80
14		120 °C, 5 h	94
15		120 °C, 4 h	90
16		120 °C, 4 h	90
17		120 °C, 4 h	95
18		120 °C, 4.5 h	75
19		120 °C, 4.5 h	85
20		120 °C, 6.5 h	70
21		120 °C, 6 h	82
22		120 °C, 5 h	95
23		120 °C, 4 h	95
24		120 °C, 4 h	90
25		120 °C, 4 h	95
26		120 °C, 4 h	75
27		120 °C, 4 h	95
28		120 °C, 6 h	85
29		120 °C, 6.5 h	75
30		120 °C, 6 h	85
31		140 °C, 6 h	70
32		140 °C, 5 h	75
33		140 °C, 5 h	75
34		140 °C, 5 h	80
35		140 °C, 6 h	72
36		140 °C, 6 h	80
37		140 °C, 6 h	85

^aIsolated yield.

^bOn 10 mmol or 20 mmol scale.