Entry | 产物 | R | m.p. (˚C) | 产率a (%) |
1 | 2a | H | 255~256 | 78 |
2 | 2b | CH3 | 248~249 | 71 |
3 | 2c | OCH3 | 251~253 | 75 |
4 | 2d | Cl | 256 | 52 |
5 | 2e | Br | 275 | 64 |
6 | 2f | I | 257~260 | 66 |