反应详情

A mixture of 2,4-di-tert-butyl-6-amino-phenol (C-9) (5.08 g, 23 mmol), NaBH3CN (4.41 g, 70 mmol) and paraformaldehyde (2.1 g, 70 mmol) in methanol (50 mL) was stirred at reflux for 3 h. After removal of the solvent, the residue was purified by column chromatography (petroleum ether-EtOAc, 30:1) to give 2,4-di-tert-butyl-6-(N-methylamino)phenol (C-24) (800 mg, 15%). 1H NMR (DMSO-d6) δ 8.67 (s, 1H), 6.84 (s, 1H), 5.99 (s, 1H), 4.36 (q, J=4.8 Hz, 1H), 2.65 (d, J=4.8 Hz, 3H), 1.23 (s, 18H); ESI-MS 236.2 m/z (MH+).

1. temperatureat reflux for 3 h
2. customAfter removal of the solvent
3. customthe residue was purified by column chromatography (petroleum ether-EtOAc, 30:1)