Table 2.
| |||||
---|---|---|---|---|---|
Entry | Substrate | Product | T(°C) | Yield (%)a | ee(%) |
1 | 23
0 |
80
81 |
58
62 |
||
2 | 23
−25 |
76
63 |
72
82 |
||
3 | 23
−25 |
72
79 |
73
84 |
||
4 | 23
−25 |
84
72 |
73
83 |
||
5 | −25 | 83 | 80 | ||
6 |
a: Ar = C6H4-4-OCH3 b: Ar = C6H4-4-F |
a: −25
b: −25 |
73
80 |
72
74 |
|
7 | 0 | 78 | 58 |
Isolated yields