Table 1.
Optimization of Pd-Catalyzed Conjunctive Cross-Coupling employing Phosphinooxazoline Ligands.a
| ||||
|---|---|---|---|---|
| ligand | R1 | R | yield (%)b | erc |
| L5 | i-Pr | Ph | 71 | 95:5 |
| L9 | t-Bu | Ph | 70 | 95:5 |
| L10 | Me | Ph | 75 | 95:5 |
| L11 | Ph | Ph | 83 | 97:3 |
| L12 | Ph | 2-furyl | 85 | 93:7 |
| L13 | Ph | mesityl | 13 | 93:7 |
| L14 | Ph | o-tolyl | trace | NA |
| L15 | Ph | Cy | 55 | 94:6 |
| L16 | Ph | 3,5-xylyl | 84 | 97:3 |
1 (0.2 mmol), 2 (0.22 mmol), solvent (0.8 mL)
Yields are of ioslated material after column chromatography.
Enantiomer ratio determined by chiral SFC analysis.