反应详情

To a solution of 1.0119 g (4.56 mmol) 20 in 25 mL of DMF was added 0.3557 g (5.47 mmol) sodium azide. After 4.5 h at room temperature, the reaction mixture was diluted with 80 mL EtOAc and washed with 40 mL brine. The aqueous layer was extracted with 20 mL EtOAc. The combined organics were dried over Na2SO4, filtered and concentrated in vacuo. Purification by flash chromatography (60×220 mm silica gel, linear gradient 5-20% (EtOAc:hexane) provided 21. 1H NMR (CDCl3, 400 MHz) δ 8.965 (dd, 1H, J=1.74, 4.21 Hz, ArH); 8.185 (dd, 1H, J=1.74, 8.32 Hz, ArH); 7.823 (dd, 1H, J=1.12, 8.32 Hz, ArH); 7.743 (d, 1H, J=6.95 Hz, ArH); 7.555 (dd, 1H, J=7.18, 8.10 Hz, ArH); 7.455 (dd, 1H, J=4.21, 8.23 Hz, ArH); 5.065 (s, 2H, ArCH2).

1. washwashed with 40 mL brine
2. extractionThe aqueous layer was extracted with 20 mL EtOAc
3. dry with materialThe combined organics were dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customPurification by flash chromatography (60×220 mm silica gel, linear gradient 5-20% (EtOAc:hexane)