Table 2.
Entry | Substrate | RBr | Product | Yieldb |
---|---|---|---|---|
1 |
7 |
8 |
75% | |
2 | 7 |
14 |
57% | |
3 | 7 |
15 |
51% | |
4 |
9 |
16 |
87% | |
5 | 9 |
17 |
71% | |
6 | 9 |
18 |
83% | |
7 | 9 |
19 |
68% | |
8 |
10 |
20 |
54% | |
9 | 10 |
21 |
56% | |
10 |
11 |
22 |
59% >20:1 dr |
|
11 |
12 |
23 |
71% >20:1 dr |
|
12 | 12 |
24 |
63% >20:1 dr |
|
13 |
13 |
25 |
ca. 47%c 2:1 dr |
|
14 |
5 |
26 |
37% |
Conditions: 1.0 equiv phenol substrate, 2.0 equiv R–Br, 2.0 equiv NaOtBu, 2 mol % Pd2(dba)3, 4 mol % S-Phos, toluene (0.25 M), 110 °C.
Isolated yield (average of two experiments).
The two inseparable stereoisomeric products were isolated in 63% yield and ca. 75% purity. The remaining 25% of the mixture was primarily composed of an unidentifed low molecular weight side product that appears to be derived from the phenol substrate.