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Comparison of different ammonium sources as reagent upon model reaction for 1aa.
| Entry | Reagent | Yield (%) |
|---|---|---|
| 1 | NH4HCO2 | 75 |
| 2 | NH4OAc | 70 |
| 3 | (NH4)2SO4 | – |
| 4 | (NH4)2CO3 | 60 |
| 5 | NH4F | – |
| 6 | (NH4)2Cr2O7 | 50 |
| 7 | NH4Cl | – |
| 8 | NH4NO3 | 35 |
aReaction conditions: 4-acetylphenyl 4-methylbenzenesulfonate (1 mmol, 0.290 g), malononitrile (1 mmol, 0.066 g), benzaldehyde (1 mmol, 0.106 g), ammonium source (1.5 mmol), solvent-free, 110 °C, 30 min.
Significant values are given in bold.
