Figure 1.
Synthesis pathway of target compounds.
| Compounds | R1 | R2 |
|---|---|---|
| 2a | methyl | methyl |
| 2b | methyl | ethyl |
| 2c | methyl | isopropyl |
| 2d | methyl | phenyl |
| 2e | ethylthio | methyl |
| 2f | ethylthio | ethyl |
| 2g | ethylthio | isopropyl |
| 2h | ethylthio | phenyl |
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