1-Methyl-3-(2-(sulfooxy)ethyl)-1H-imidazol-3-ium Chloride as a New and Green Ionic Liquid Catalyst for One-Pot Synthesis of Dihydropyrimidinones under Solvent-Free Condition

Table 3

Comparison of catalytic ability of catalysts.

Entry	Catalyst	Time (min); condition	Yield (%) (reference)
1	[BMIM]FeCl4	120	90
		90°C, s.f.^a	[7]
2	[HMIM]Tfa	45	90
		50°C, s.f.	[4]
3	[BMIM]BF4	30	99
		100°C, s.f.	[8]
4	[HMIM]HSO4	90	96
		80°C, s.f.	[9]
5	[MSEI]Cl	30	93
		80°C, s.f.	—

as.f.: solvent free condition.