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Reactions of methyl 4-oxocarboxylates with methyl methacrylate.
 | |||
| Entry | 2 (R1) | Time (h) | Yield (%) |
| 1a | 2a (C6H5) | 4 | 90 |
| 2b | 2b (o-CH3OC6H4) | 24 | 76 |
| 3b | 2c (m-CH3OC6H4) | 16 | 71 |
| 4b | 2d (p-CH3OC6H4) | 12 | 84 |
| 5b | 2e (p-BrC6H4) | 6 | 86 |
| 6a | 2f (CH3) | 4 | 85 |
a2a (0.25 mmol):1:PMHS:CuX:ligand = 1:1.5:3:1%:1%; b2: 1: PMHS:CuX:ligand = 1:1.5:3:2%:2%.
