Comparison of efficiency of present catalyst with other catalysts reported in literature.

Entry	Catalyst/condition	Time (min)	Yield	References
1	Ionic liquids, reflux	260	84	26
2	Choline hydroxide, reflux	240	86	27
3	No catalyst/trifluoroethanol, reflux	360	80	28
4	Fe 3 O 4 @sulfosalicylic acid/H 2 O, M W	10	96	25