Table 2. Synthesis of Substituted Tetrahydrofurans.
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entry | R | product | % yield | dra |
1 | −CH3 | 2a | 70 | 11:1 |
2 | −CH2CH3 | 2b | 91 | 60:1 |
3 | −CH2CN | 2c | 82 | 11:1 |
4 | −CH2-C6H5 | 2d | 91 | 49:1 |
5 | −CH2-C6H5-pNO2 | 2e | 70 | 14:1 |
6 | −CH2CH2CHCH2 | 2f | 86 | 100:1 |
7 | −H | 2g | 55 | 1:1 |
The dr was determined by 1H NMR of the crude reaction mixture.