反应详情

温度

55 °C

A solution of [4-(2,2,4,4-tetramethyl-chroman-6-yl-ethynyl)phenyl] acetic acid methyl ester (Compound 27, 0.047 g, 0.13 mmol) in 5 mL of methanol was treated with 1M sodium hydroxide solution (2 mL) and heated at 55° C. for 2 h. The volatiles were distilled off in vacuo and the residue was acidified with 10% hydrochloric acid and extracted with ethyl acetate (×2). The combined organic phase was washed with brine (×1), dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to a residue which was purified by preparative reverse phase HPLC using 10% water in acetonitrile as the mobile phase to afford the title compound (0.034 g, 82%). 1H NMR (300 MHz, CDCl3): δ 7.49-7.45 (m, 3H), 7.26-7.22 (m, 3H), 6.75 (d, 1H, J=8.2 Hz), 3.65 (s, 2H), 1.84 (s, 2H), 1.36 (s, 6H), 1.35 (s, 6H).

1. distillationThe volatiles were distilled off in vacuo
2. extractionextracted with ethyl acetate (×2)
3. washThe combined organic phase was washed with brine (×1)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. customevaporated in vacuo to a residue which
7. customwas purified by preparative reverse phase