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 2

Dihydropyrimidinones synthesis catalyzed by BrØnsted acidic ionic liquid (BAIL).

Entry	R1	R2	X	Time (min)	Yield (%)	M.p. (°C)
						Found	Reported
1	Ph	Me	O	30	93	231–233	235-236 [1]
2	4-OH–C6H4	Me	O	30	95	254–256	256–258 [2]
3	4-Me–C6H4	Me	O	30	92	231-232	228-229 [1]
4	4-MeO–C6H4	Me	O	30	90	175–177	177–179 [2]
5	4-Cl–C6H4	Me	O	30	92	223-224	224–226 [3]
6	4-NO2–C6H4	Me	O	45	85	227 (dec)	229 (dec) [2]
7	3-NO2–C6H4	Me	O	45	82	246–248	248–250 [1]
8	Ph	OEt	O	45	88	203–205	201-202 [1]
9	2-OH–C6H4	OEt	O	45	92	200–202	201–203 [3]
10	4-Me–C6H4	OEt	O	45	90	170–172	170-171 [1]
11	4-MeO–C6H4	OEt	O	45	87	198–200	199–201 [4]
12	4-Cl–C6H4	OEt	O	45	86	211–213	209-210 [1]
13	3-NO2–C6H4	OEt	O	60	78	225–227	226-227 [4]
14	Ph	Me	S	75	81	230-231	232–233 [5]
15	2-OH–C6H4	Me	S	75	83	239–241	242-243 [3]
16	4-Me–C6H4	Me	S	75	80	221–223	222–224 [5]
17	4-NO2–C6H4	Me	S	90	73	106-107	108–110 [6]
18	Ph	OEt	S	105	75	206–208	208-209 [5]
19	4-Me–C6H4	OEt	S	105	72	193-194	193-194 [1]
20	4-NO2–C6H4	OEt	S	120	70	214–216	209–212 [3]