反应详情

DBU (1 mL, 6.62 mmol) and diphenyl phosphoryl azide (1.6 mL, 7.5 mmol) were added to a solution of 2-benzyloxy-5-trifluoromethyl-benzyl alcohol (1.24 g, 4.41 mmol) in anhydrous toluene (10 mL) at room temperature. After 3 hours, water was added and the mixture extracted with ethyl acetate (3×). The combined organic layers were washed with 1N HCl (1×), brine (1×), dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified by flash chromatography (3% ethyl acetate/hexanes) to afford 1.14 grams of the title compound as a colorless oil (84%). MS 280 (M−N2)+. 1H NMR (400 MHz, CDCl3) δ 7.6-7.3 (m, 7H); 7.01 (d, 1H, J=9.1 Hz); 5.18 (s, 2H); 4.42 (s, 2H).

1. extractionthe mixture extracted with ethyl acetate (3×)
2. washThe combined organic layers were washed with 1N HCl (1×), brine (1×)
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash chromatography (3% ethyl acetate/hexanes)