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Tautomerization with TFA and DBU
| additive (equiv) | time (h) | 9c′/9c |
|---|---|---|
| none | 0.5 | 55:45 |
| none | 18 | 55:45 |
| TFA (3) | 0.5 | 43:57 |
| TFA (3) | 18 | 0:100 |
| DBU (0.5) | 0.5 | 22:78 |
| DBU (0.5) | 18 | 0:100 |
Methyl (3aS,6aS)-5-Benzyl-3-(2-nitrophenyl)-3a,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole-6a(1H)-carboxylate (9d).
