| No. | R1 | R2 | R3 | X | No. | Yield (%) |
|---|---|---|---|---|---|---|
| 5 | H | H | H | CH | 21 | 95 |
| 6 | H | H | Et | CH | 22 | 93 |
| 7 | Me | H | H | CH | 23 | 85 |
| 8 | Me | Me | H | CH | 24 | 88 |
| 9 | H | H | H | N | 25 | 88 |
| 10 | H | H | Et | N | 26 | 91 |
| 11 | Me | H | H | N | 27 | 87 |
| 12 | Me | Me | H | N | 28 | 64 |
| No. | R1 | R2 | R3 | X | No. | Yield (%) |
|---|---|---|---|---|---|---|
| 5 | H | H | H | CH | 21 | 95 |
| 6 | H | H | Et | CH | 22 | 93 |
| 7 | Me | H | H | CH | 23 | 85 |
| 8 | Me | Me | H | CH | 24 | 88 |
| 9 | H | H | H | N | 25 | 88 |
| 10 | H | H | Et | N | 26 | 91 |
| 11 | Me | H | H | N | 27 | 87 |
| 12 | Me | Me | H | N | 28 | 64 |