Table 1. Allylic alkylation of 1,3-diphenylprop-2-enyl acetate (2) with dimethyl malonate and p5 or p(5-co-8) as ligand.
| No. | Ligand | Pd,* mol% | Temp., °C | Time, hr | Yield,† % | ee,‡ % |
|---|---|---|---|---|---|---|
| 1 | (+)-p5 | 25 | 40 | 1 | 91§ | 6.4 |
| 2 | (+)-p5 | 10 | 25 | 3 | 85§ | 4.7 |
| 3 | (+)-p5 | 5 | 25 | 6 | 87§ | 6.4 |
| 4 | (+)-p5 | 2 | 25 | 150 | 20 | 5.8 |
| 5 | (+)-p(5-co-8) | 10 | 25 | 4.5 | 83§ | 38 |
| 6 | (+)-p(5-co-8) | 25 | 25 | 1 | 84§ | 44 |
| 7 | (+)-p(5-co-8) | 25 | 0 | 16 | 99 | 60 |
| 8 | (+)-p(5-co-8) | 25 | -10 | 64 | 72 | 55 |
Reaction was in CH2Cl2,[Pd]/[repeating units] = 1:1.2.
Based on substrate 2.
Yields of isolated product.
Determined by 1H-NMR in the presence of 20 mol % of the chiral shift reagent [Eu(hfc)3], hfc = 3-(heptafluoropropylhydroxymethylene)-d-camphorate. All products were (R)-configured (determined by comparison with ref. 28).
Quantitative conversion according to TLC.