Table 4.
Enantioselective Synthesis of Tetrahydroisoquinolinesa
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---|---|---|---|---|
Entry | R–X | Product | Yield (%)b | er |
1 | p-MeO-C6H4–Br | 6a | 51 | 93:7 |
2 | p-MeO-C6H4–I | 6a | 52 | 93:7 |
3 | o-MeO-C6H4–I | 6b | 42 | 80:20 |
4 | p-CF3-C6H4–Br | 6c | 72 | 93:7 |
5 |
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6d | 61 | 93:7 |
6 | PhBr | 6e | 69 | 94:6 |
7c | PhBr | 6e | 64 | 95:5 |
8 |
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6f | 56 | 93:7 |
9c |
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6f | 55 | 94:6 |
Conditions: 1.0 equiv 5, 1.2 equiv R–X, 1.2 equiv NaOtBu, 2 mol % Pd2(dba)3, 6 mol % (S)-Siphos-PE, toluene (0.125 M), 90 °C, 2 h.
Isolated yield (average of two or more runs).
The reaction was conducted at 70 °C for 12-14 hrs.