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温度

0 °C

To a mixture of 3 (60 mg, 0.192 mmol), 4-aminophenol (23.0 mg, 0.211 mmol), 4-Dimethylaminopyridine (1.2 mg, 0.00982 mmol) and N,N-Diisopropylethylamine (37.2 mg, 0.287 mmol) in CH2Cl2 (2 ml) was added O-Benzotriazoyl-N,N,N′,N′-tetramethyluronium Hexafluorophosphate (76.5 mg, 0.202 mmol) under ice cooling, and the mixture was stirred at 0° C. for 5 min, and at room temperature for 15 h. The reaction was quenched with saturated aqueous NaHCO3 under ice cooling, and the whole was extracted with CHCl3, the organic layer was washed with brine, dried over Na2SO4, and then concentrated. Purification by silica gel flash column chromatography (eluent: hexane/AcOEt, 3:1 to 2:1) gave 6a (68%). 6a: colorless powder; 1H-NMR (CDCl3) δ 1.05 (3H, t, J=7.5 Hz), 2.77 (2H, t, J=7.5 Hz), 3.43 (3H, s), 5.09 (2H, s), 6.79 (4H, m), 7.00 (2H, d, J=8.8 Hz), 7.00 (1H, brs), 7.07 (2H, m), 7.15-7.22 (3H, m), 7.37 (2H, d, J=8.8 Hz).

1. waitat room temperature for 15 h
2. customThe reaction was quenched with saturated aqueous NaHCO3 under ice cooling
3. extractionthe whole was extracted with CHCl3
4. washthe organic layer was washed with brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customPurification by silica gel flash column chromatography (eluent: hexane/AcOEt, 3:1 to 2:1)