Table 1 Suzuki–Miyaura cross-coupling of 15a and 16aa
Entry | Catalyst (5 mol%) | Base (equiv) | Solvent | T (oC) | Yield (%)b |
|---|---|---|---|---|---|
1 | PdCl2(dppf) | K2CO3 | DMSO | 85 | 21 |
2 | Pd(PPh3)4 | K2CO3 | dioxane | 85 | 34 |
3 | Pd(PPh3)4 | K3PO4 | dioxane | 85 | 44 |
4 | Pd(OAc)2/dppp | K2CO3 | dioxane | 85 | 33 |
5 | Pd(OAc)2/dppb | K2CO3 | dioxane | 85 | 41 |
6 | PdCl2/dppp | K2CO3 | dioxane | 85 | 22 |
7 | Pd(OAc)2/dppb | K3PO4 | dioxane | 85 | 61 |
8 | 18 | K2CO3 | DMF/EtOH (v/v = 1:1) | rt | >99c |
9 | 18 | K2CO3 | DMF/EtOH (v/v = 1:1) | rt | 95d |
