Table 1.
| ||||
---|---|---|---|---|
Entry | Ni Source | Ni/DPPF (mol %) | Solvent | Yield[b] (%) |
1 | Ni(COD)2 | 5/10 | DME | 72 |
2 | Ni(COD)2 | 5/5 | DME | 39 |
3 | Ni(COD)2 | 5/7.5 | DME | 46 |
4 | Ni(COD)2 | 5/10 | THF | 46 |
5 | Ni(COD)2 | 5/10 | CPME | <5 |
6 | Ni(COD)2 | 5/10 | dioxane | <5 |
7 | Ni(COD)2 | 5/10 | 2-Me-THF | 52 |
8 | NiCl2 | 5/10 | DME | 35 |
9 | NiBr2 | 5/10 | DME | 51 |
10 | Ni(COD)2 | 7.5/15 | DME | 90 (88)[c] |
Reactions conducted on a 0.1 mmol scale.
Yields determined by 1H NMR spectroscopy of the crude reaction mixtures.
Isolated yield after chromatographic purification.