| Het | %Yield Condition (i) | %Yield Condition (ii) | |
|---|---|---|---|
| 21a | 2-thienyl | 91 | 78 |
| 21b | 2-furyl | 73 | 87 |
| 21c | 2-(N-methylimidazole) | - | 52 |
| 21d | 5-(N-methyl-[1,2,4]-triazole) | - | 69 |
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