Table 2.
Entry | Vinyl bromide | Product (E/Z ratio)[b] | 3/4[b] | Yield [%][b] |
---|---|---|---|---|
1 | 14:1 | 81[c] | ||
2 | 17:1 | 85 | ||
3 | 17:1 | 89 | ||
4 | 13:1 | 78[d] | ||
5 | >20:1 | 88 | ||
6 | 19:1 | 77 | ||
7 | >20:1 | 77 | ||
8 | >20:1 | 87 | ||
9 | >20:1 | 88 |
Conditions: amine 1 (1.0 equiv), vinyl bromide 2 (1.1–2.0 equiv), NaO t-Bu (1.2 equiv), Pd2(dba)3 (1 mol%), P(2-furyl)3 (4 mol %), toluene (0.25 M), 60–110 °C.
Product ratios refer to the isolated material, as judged by 1H NMR analysis. Product ratios and yields refer to the average of two or more experiments.
This material contained ~5 % of 5a as an inseparable impurity.
This material contained ~10 % of 5d as an inseparable impurity.