Table 1.
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Pd source | L | Pd/L (mol %) | base | assay yield (%) | |
1 | Pd(OAc)2 | L1 | 10/15 | LiN(SiMe3)2 | 78 |
2 | Pd(OAc)2 | L2 | 10/15 | LiN(SiMe3)2 | 60 |
3 | Pd(OAc)2 | L3 | 10/15 | LiN(SiMe3)2 | 59 |
4 | Pd(OAc)2 | L4 | 10/15 | LiN(SiMe3)2 | 49 |
5 | Pd(OAc)2 | L1 | 2.5/3.75 | LiN(SiMe3)2 | 75 |
6 | [PdCl(allyl)]2 | L1 | 2.5/3.75 | LiN(SiMe3)2 | 74 |
7 | Pd(dba)2 | L1 | 2.5/3.75 | LiN(SiMe3)2 | 88 |
8 | Pd(dba)2 | L1 | 2.5/5.0 | LiN(SiMe3)2 | 88 |
9 | Pd(dba)2 | L1 | 2.5/2.5 | LiN(SiMe3)2 | 96 |
10 | Pd(dba)2 | L1 | 2.5/2.5 | NaN(SiMe3)2 | 60 |
11 | Pd(dba)2 | L1 | 1.0/1.0 | LiN(SiMe3)2 | 95(94)c |
12 | Pd(dba)2 | L1 | 0.5/0.5 | LiN(SiMe3)2 | 77 |
Reactions conducted on a 0.1 mmol scale using 1 equiv of 1a, and 1.5 equiv of 2a.
Assay yields determined by 1H NMR spectroscopy of the crude reaction mixtures.
Isolated yield after chromatographic purification.