Table 2.
Percentage yields of 5a,b; 6a,b and 4e,f.
| Substrate | R | 5a,b | 6a,b | 4e,f |
|---|---|---|---|---|
| 1a | H | 81 (5a) | 77 (6a) | 81 (4a) |
| 1b | 4-ClC6H4- | 88 (5b) | 88 (6b) | 59 (4k) |
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