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温度

0 °C

To a cooled (0° C.) solution of tert-butyl 4-(4-formylphenyl)piperazine-1-carboxylate (1.0 g, 3.44 mmol) in ether (17 mL) and THF (3 mL) was added solid lithium borohydride (38 mg, 1.72 mmol) in one portion. The reaction mixture stirred for 1 h at 0° C. before being quenched with 1 N HCl to reach pH=7. The resulting organic layer was filtered through a pad of celite and concentrated to obtain tert-butyl 4-(4-(hydroxymethyl)phenyl)piperazine-1-carboxylate as an orange solid (1 g) 1H NMR (300 MHz, CDCl3): δ 7.30 (d, 2H, J=8.6 Hz), 6.93 (d, 2H, J=8.6 Hz), 4.61 (d, 2H, J=5.0 Hz), 3.59 (dd, 4H, J=5.3, 5.1 Hz), 3.14 (dd, 4H, J=5.2, 5.0 Hz), 1.49 (m, 9H); 13C NMR (150 MHz, CDCl3): δ 154.94, 151.11, 132.92, 128.59, 116.84, 80.14, 65.24, 49.66, 43.48, 28.64; Minor rotomeric populations are also visible; HRMS calcd for C16H24N2O3: 293.185969 found 293.18590.

1. custombefore being quenched with 1 N HCl
2. filtrationThe resulting organic layer was filtered through a pad of celite
3. concentrationconcentrated