Entry

Solvent

ԑ à 25˚C

Yield (%)a^*

Yield (%)b^*

1

MeOH

33

47

88

2

EtOH

32.6

43

81

3

iPrOH

18

40

79

4

THF

7.58

22

50

5

Toluene

2.38

8

40

6

Acetonitrile

37.5

35

72

7

DMF

36.70

27

40

8

Water

87

34

77

9

Water/Acetonitrile (v/v = 1:1)

-

15

20

10

Water/EtOH (v/v = 1:1)

-

55

90

11

Water/DMF (v/v = 1:1)

-

58

95

12

Water/MeOH (v/v = 1:1)

-

33

52

13

Water/MeOH (v/v = 2:1)

-

54

90

14

Water/EtOH (v/v = 2:1)

-

59

94

15

Water/i-PrOH (v/v = 2:1)

-

48

85

16

Water/Dioxane (v/v = 2:1)

-

48

89

17

Water/THF (v/v = 2:1)

-

49

73

18

Water DMF (v/v = 2:1)

-

52

89