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The synthetic route for target compounds (2a–2l).
| Compounds | X | R |
|---|---|---|
| 2a | –O | –Ethyl |
| 2b | –O | –2-Methoxyethyl |
| 2c | –O | –Butyl |
| 2d | –O | –Cyclohexyl |
| 2e | –O | –Phenyl |
| 2f | –O | –2-Chlorophenyl |
| 2g | –S | –Ethyl |
| 2h | –S | –2-Methoxyethyl |
| 2i | –S | –Butyl |
| 2j | –S | –Cyclohexyl |
| 2k | –S | –Phenyl |
| 2l | –S | –2-Chlorophenyl |
