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| ||||
|---|---|---|---|---|
| Entry | Substrate | Conditions | Product | e.r. |
| 1 |
|
HFIP | trans-20a | 97:3 |
|
|
|
|||
| 2 | CH2Cl2 MsOH (0.4 equiv) |
trans-20a | 97:3 | |
|
| ||||
| 3 |
|
HFIP | cis-20a | 98:2 |
|
|
|
|||
| 4 | CH2Cl2 MsOH (0.4 equiv) |
cis-20a | 97:3 | |
All reactions performed on a 0.10 mmol scale.
Enantiomeric ratio determined by CSP-HPLC analysis.
