Results of Bingel's synthesis with inorganic bases under HSVM conditions in the absence of solvents.
| Entry | Base | Yield of 1, % |
|---|---|---|
| 1 | NaOAc | 59 |
| 2 | Na2CO3 | 51 |
| 3 | NaHCO3 | 48 |
| 4 | Ca(OH)2 | 45 |
| 5 | Na2B4O7 × 10H2O | 44 |
| 6 | K2CO3 | 29 |
| 7 | NaOH | 11 |
| 8 | KOH | 17 |
| 9 | Alkaline Al2O3 | 10 |
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