Entry

Mole ratio of 1a/2

Solvent

Temp (˚C)

Time (h)

Yield (%)

1

1:1

CH3CN

r.t

6

30

2

1:1.5

CH3CN

r.t

6

50

3

1:2

CH3CN

r.t

6

80

4

1:2

CH3CN

Reflux

6

60

5

1:2

CH3CN

0

6

70

6

1:2

CH3CN

rt

24

97

7

1:2

THF

rt

6

20

8

1:2

CH2Cl2

rt

6

40

9

1:2

Toluene

rt

6

0

10

1:2

CH2Cl2/Toluene

rt

6

30