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Table 4 Synthesis of DHPMs 4aw by using Fe3O4@PVA-SO3H under refluxing conditions

From: Design and preparation of Fe3O4@PVA polymeric magnetic nanocomposite film and surface coating by sulfonic acid via in situ methods and evaluation of its catalytic performance in the synthesis of dihydropyrimidines

Entry

R1

R2

X

Product

Time (min)

Yielda (%)

Mp (°C)

Found

Reported

1

C6H5

Et

O

4a

10

99

201–202

201 [19]

2

4-ClC6H4

Et

O

4b

10

98

210–212

213 [36]

3

3-O2NC6H4

Et

O

4c

10

97

225–226

224–226 [36]

4

4-O2NC6H4

Et

O

4d

10

98

208–209

206–208 [36]

5

2,4-(Cl)2C6H3

Et

O

4e

10

95

248–250

248–250 [32]

6

4-OHC6H4

Et

O

4f

12

90

230–231

231–233 [36]

7

3,4,5-(CH3O)3C6H2

Et

O

4g

10

87

178–180

178–180 [37]

8

3-OHC6H4

Et

O

4h

15

85

222–223

221 [19]

9

3,4-(OH)2C6H3

Et

O

4i

20

80

247–248

243–244 [38]

10

4-FC6H4

Et

O

4j

10

99

181–182

181–183 [39]

11

4-BrC6H4

Et

O

4k

10

98

215–217

213 [19]

12

2-OHC6H4

Et

O

4l

15

92

201–203

198–200 [37]

13

2-Thienyl

Et

O

4m

15

95

203–204

200–202 [40]

14

2-Pyridyl

Et

O

4n

15

95

181–183

182–184 [40]

15

2-Furanyl

Et

O

4o

10

95

212–213

211–213 [40]

16

C6H5

Et

S

4p

10

98

204–205

203 [19]

17

4-FC6H4

Et

S

4q

10

96

180–181

179–181 [39]

18

3-OHC6H4

Et

S

4r

20

82

184–186

184–186 [37]

19

C6H4

Me

O

4s

10

98

215–218

215–218 [36]

20

4-ClC6H4

Me

O

4t

10

97

204–206

205–207 [36]

21

4-MeC6H4

Et

O

4u

10

92

208–210

209–210 [36]

22

3-OHC6H4

Me

O

4v

15

84

224–225

222 [19]

23

C6H4

Me

S

4w

10

97

224–227

222–224 [36]

  1. aIsolated yield