Entry

Catalyst

Solvent

Time (h)

Yield (%)^b

ee (%)^c

1

A-1 (30 mol%)

Hexane

72

62

77

2

A-2 (30 mol%)

Hexane

90

60

72

3

A-3 (30 mol%)

Hexane

90

79

83

4

A-4 (30 mol%)

Hexane

60

92

90

5

A-5 (30 mol%)

Hexane

140

70

92

6

B (30 mol%)

CH₂Cl₂

72

13

47

7

C (30 mol%)

CH₂Cl₂

72

17

29

8

B (30 mol%)

Hexane

72

–

–

9

B (30 mol%)

Toluene

72

15

67

10

B (30 mol%)

m-Xylene

72

22

66