Table 1.
entry | E-X | ligand | Ni salt | % yielda | er |
---|---|---|---|---|---|
1 | 2 | none | Ni(acac)2 | <10% | nd |
2 | 2 | L1 | Ni(acac)2 | <10% | nd |
3 | 2 | L2 | Ni(acac)2 | <10% | nd |
4 | 2 | L3 | Ni(acac)2 | <10 | nd |
5 | 2 | L4 | Ni(acac)2 | <5% | nd |
6b | 2 | L5 | Ni(acac)2 | 17 | 89:11 |
7b | 2 | L6 | Ni(acac)2 | 36 | 99:1 |
8b,c | 2 | L6 | Ni(acac)2 | 49 | 98:2 |
9b,c | 2 | L6 | [(methallyl)NiCI]2 | 51 | 98:2 |
10b,c | 2 | L7 | [(methallyl)NiCI]2 | 70 | 98:2 |
11b,c | 3 | L7 | Ni(acac)2 | 34 | 50:50 |
12d | 3 | Ni(acac)2 | 92 | nd |
Determined by NMR versus an internal standard.
Determined by chiral SFC analysis.
Catalyst solution pre-complexed for 1.5 h.
Reaction conducted at 22 °C without ligand and with one equivalent NaI added.