Table 9.
Comparison of Nok vs. TPGS-750-M in Stille Couplings
|
| ||||||
|---|---|---|---|---|---|---|
| Entry | Aryl halide | Partner | Product | TPGS-750-Ma yield(%) | Noka yield(%) | Time (h) |
| 1 |
|
|
|
98 | 99 | 2 |
| 2 |
|
|
|
100 | 99 | 4 |
| 3 |
|
|
|
58 | 56 | 8 |
| 4 |
|
|
|
83 | 84 | 18 |
| 5 |
|
|
|
84 | 97 | 4 |
Isolated yields of chromatographically pure materials. Conditions: aryl bromide (0.25 mmol, 1 equiv), stannyl reagent (0.275 mmol, 1.1 equiv), catalyst Pd(t-Bu3P)2 (2 mol %), base DABCO (3 equiv), NaCl (1 equiv) and 2 wt % surfactant/H2O.