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Reactions of 4-oxobutanoates with t-butyl acrylatea.
 | ||||
| Entry | 2 (Ar) | Time (h) | anti/syn | Yield (%) |
| 1b | 2a (C6H5) | 4 | 28:72 | 91 |
| 2 | 2b (o-CH3OC6H4) | 22 | 50:50 | 82 |
| 3 | 2c (m-CH3OC6H4) | 6 | 29:71 | 91 |
| 4 | 2d (p-CH3OC6H4) | 8 | 42:58 | 94 |
| 5 | 2e (p-BrC6H4) | 6 | 43:57 | 97 |
a2:1d:PMHS:CuX:Xantphos = 1: 1.2: 2:2%:2%, 25 °C, in toluene unless otherwise noted; b2:1d:PMHS:CuX:Xantphos = 1:1.2:2:1%:1%.
