反应详情

A flame-dried 200 mL round bottomed flask was charged with 3-(2-formyl-4-hydroxyphenyl)acrylic acid tert-butyl ester (10.0 g, 40.3 mmol), tert-butylchlorodiphenylsilane (12.6 mL, 48.3 mmol), and dry CH2Cl2 (150 mL). Triethylamine (11.2 mL, 80 mmol) and N,N-dimethylaminopyridine (1.0 g, 1.0 mmol) were added, and the mixture was stirred at ambient temperature under a nitrogen atmosphere for 16 h. The reaction mixture was diluted with additional CH2Cl2, washed with brine (2×), dried (Na2SO4), and concentrated to an oil. The crude product was purified using the Biotage medium pressure chromatography system (EtOAc:hexanes 5:95) to give a pale yellow oil (18.3 g, 93%). 1H NMR (400 MHz, CDCl3) δ 1.12 (s, 9H), 1.51 (d, J=15.1 Hz, 9H), 6.15 (d, J=5.1 Hz, 1H), 6.87 (dd, J=8.6, 2.7 Hz, 1H), 7.34-7.47 (m, 7H), 7.68-7.73 (m, 5H), 8.28 (d, J=15.6 Hz, 1H), 10.1 (s, 1H). MS (ES) m/e 487 (M+1).

1. washwashed with brine (2×)
2. dry with materialdried (Na2SO4)
3. concentrationconcentrated to an oil
4. customThe crude product was purified