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Reactivity for the Protonation Reactions
 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| entry | catalyst | time (h) | % yielda | erb | entry | catalyst | time (h) | % yielda | erb |
| 1 | 1 | 96 | NR | ND | 3 | 3 | 4.5 | >99 (98) | 77:23 (S) |
| 4 | 4c | 3.5 | >99 (97) | 89:11 (S) | |||||
| 2 | 2 | 96 | trace | ND | 5 | 5 | 3.5 | >99 (97) | 86:14 (S) |
Yield was measured by 1H NMR analysis, and the isolated yields are shown in parentheses.
Enantiomeric ratio (er) was determined by HPLC analysis. NR and ND mean no reaction and not determined, respectively.
