Table 2.

Effect of the amount of PEG 400 on the synthesis of 3a under ultrasound irradiation

Entry	PEG 400/mol%	Time/min	Yielda/%
1	0	150	11
2	1	90	35
3	2	80	54
4	3	60	71
5	4	50	77
6	5	30	81
7	6	30	82

Aniline (10 mmol), α-bromoacetophenone (20 mmol), sodium carbonate (10 mmol), and 350 W ultrasound

^aIsolated yield