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Comparison between methods for the synthesis of compounds 8a,b and 9a,b.
| Compound No. | Reflux | MW | US | |||
|---|---|---|---|---|---|---|
| Time | Yield% | Time | Yield% | Time | Yield% | |
| 8a | 300 min. | 62 | 2 min. | 74 | 60 min. | 52 |
| 8b | 240 min. | 60 | 2 min. | 71 | 60 min. | 40 |
| 9a | 360 min. | 63 | 2 min. | 76 | 60 min. | 60 |
| 9b | 420 min. | 67 | 2 min. | 78 | 60 min. | 43 |
