4

(S)-2 from 4

(S)-3

(R)-2

Entry

Substrate

n

Yield (%)

Ee (%)b

Yield (%)

Ee (%)b

Yield (%)

Ee (%)c

1

4a

2

33

83

39

83

62

>99

2

4b

3

25

>99

48

99

93

>99

3

4c

4

25

99

50

>99

96

>99

4

4d

5

25

97

45

97

75

>99

5

4e

6

25

90

45

85

75

98

6

4f

8

30

80

50

>99

80

>99