No.

Schiff base

Solvent

Temp (˚C)

Yield of Ala (%)

S (e.e.%)

1

8a

MeOH

30

50

64

2

MeOH

10

29

62

3

MeOH

–10

32

67

4

MeOH

–30

10

50

5

EtOH

–10

33

46

6

2-PrOH

–10

20

75

7

THF

–10

24

45

8

AcOEt

–10

28

71

9

8c

MeOH

30

38

63

10

MeOH

10

23

29

11

MeOH

–10

39

77

12

MeOH

–30

8

23

13

EtOH

–10

40

78

14

2-PrOH

–10

22

42

15

THF

–10

15

40

16

AcOEt

–10

25

58