Table 12.
Arylhalogenation of cis-48 and trans-48a
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|---|---|---|---|---|---|
| Entry | Substrate | Oxidant | Solvent | Yieldb,c | Ratio 49 : 50b |
| 1 | cis-48 | PhICl2 | CH2Cl2 | 40% | 12 : 1 |
| 2 | cis-48 | CuCl2 | Et2O | 51% | >30 : 1 |
| 3 | cis-48 | CuBr2 | Et2O | 41% | 5 : 1 |
| 4 | trans-48 | PhICl2 | CH2Cl2 | 21% | 1 : 1.6 |
| 5 | trans-48 | CuCl2 | Et2O | 45% | 1 : 8 |
| 6 | trans-48 | CuBr2 | Et2O | 9% | 1 : 8 |
Conditions: 2 equiv PhSnBu3, 10 mol % PdCl2(PhCN)2, 0.032 M, −78 → 23 °C, 36 h.
Yield and selectivity determined by 1H NMR spectroscopic analysis of crude reaction mixture.
The mass balance in these reactions is accounted for by recovered starting material as well as the corresponding Mizoroki-Heck product. See Supporting Information for full details.
