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Hydrozirconation and Pd-catalyzed cross coupling of 25a and 26a by using different Pd catalysts.
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| entry | catalyst | yield 27a [%] |
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| 1 | (PPh3)2PdCl2 | 55 |
| 2 | (PhCN)2PdCl2 | 25 |
| 3 | (dppp)PdCl2 | 14 |
| 4 | (dppf)PdCl2 | 11 |
| 5 | Pd(PPh3)4 | 7 |
| 6 | (AntPhos)2Pd(dba) | traces |
| 7 | (XPhos)2Pd(dba) | – |
