From: Microwave-assisted synthesis and antioxidant properties of hydrazinyl thiazolyl coumarin derivatives
Entry | Compound | R1 | R2 | R3 | R4 | Yield% under microwave irradiation†| Yield% using traditional conditions‡ |
---|---|---|---|---|---|---|---|
1 | 7a | OH | H | H | H | 70 | 69 |
2 | 7b | H | OH | H | H | 82 | 66 |
3 | 7c | H | H | OH | H | 71 | 71 |
4 | 7d | OH | H | OH | H | n/a | 76 |
5 | 7e | OH | H | H | Br | 78 | 64 |
6 | 7f | OH | OMe | H | H | 72 | 69 |
7 | 9a | H | - | - | - | 92 | 67 |
8 | 9b | OH | - | - | - | 72 | 62 |