Entry

Product

R

Time (min)

Yield (%, w/w )

1

4a

H

25

93%

2

4b

4-OCH₃

25

90%

3

4c

4-Chloro

25

92%

4

4d

4-NO₂

25

96%

5

4e

2-NO₂

25

95%

6

4f

4-(2-pyridyl)

25

94%