Entry

R1

R2

Product

Yieldb/%

1

Ph

Ph

3a

86

2

p-Cl-C6H4

Ph

3b

94

3

p-Br-C6H4

Ph

3c

90

4

p-CH3-C6H4

Ph

3d

94

5

p-CH3O-C6H4

Ph

3e

86

6

2-furyl

Ph

3f

73

7

Ph

p-F-C6H4

3g

98

8

Ph

p-Cl-C6H4

3h

92

9

Ph

p-Br-C6H4

3i

89

10

Ph

p-CH3O-C6H4

3j

85

11

Ph

2-naphthyl

3k

87

12

p-CH3O-C6H4

p-Cl-C6H4

3l

79

13

p-Cl-C6H4

p-CH3O-C6H4

3m

82

14c

Ph

Ph

3a

85