From: Microwave-assisted synthesis and antioxidant properties of hydrazinyl thiazolyl coumarin derivatives
Entry | Base | Reagents & conditions†| Yield%‡ |
---|---|---|---|
1 | Piperidine | Solvent-free, 50°C, 5 min | -a |
2 | l-Proline | EtOH, 50°C, 5 min | 54 |
3 | l-Proline | EtOH, 50°C, 10 min | 59 |
4 | l-Proline | EtOH, 120°C, 1 min | 72 |
5 | l-Proline | EtOH, 120°C, 2 min | 93 |
6 | Piperidine | EtOH, 120°C, 1 min | 74 |
7 | Piperidine | EtOH, 120°C, 10 min | 98 |
8 | Piperidine | EtOH, 50°C (20 W), 5 min | 99 |