反应详情

温度

0 °C

A stirred suspension of PCC (42.3 g, 196 mmol) and Celite (43 g) in DCM (300 mL) was cooled to 0° C. To this was added carbamate 129 (35.0 g, 131 mmol), slowly over a period of 15 min. The reaction mixture was allowed to stir at room temperature for 2 h during which the transformation was found to be complete. The reaction mass was then filtered through a pad of Celite and the filter bed was washed with DCM. Concentration of the filtrate gave a black tarry mass which was purified by flash chromatography (30-50% Ethyl acetate-Hexanes gradient) to give tert-butyl 3-(3-hydroxyphenyl)-3-oxopropylcarbamate (145) as pale yellow solid. Yield (20.3 g, 58%): 1H NMR (400 MHz, CDCl3) δ 9.78 (s, 1H), 7.27-7.40 (m, 2H), 7.01 (dd, J=8.0, 1.6 Hz, 1H), 6.80-6.83 (m, 1H), 3.22-3.27 (m, 2H), 3.08 (t, J=6.8 Hz, 2H), 1.36 (s, 9H).

1. filtrationThe reaction mass was then filtered through a pad of Celite
2. washthe filter bed was washed with DCM
3. customConcentration of the filtrate gave a black tarry mass which
4. customwas purified by flash chromatography (30-50% Ethyl acetate-Hexanes gradient)