反应详情

温度

105 °C

To a solution of 167b (5.0 g, 22 mmol) in DMSO (30 mL) was added NaN3 (2.2 g, 33 mmol). The mixture was heated at 105° C. for 6 hours. Water (13 mL) was added to the reaction mixture after cooling down to room temperature and the resulting mixture was extracted with methylene chloride (3×50 mL). The combined organic phase was dried over Na2SO4 and evaporated under reduced pressure to dryness. The residue was purified by silica-gel column chromatography eluting with 20:1 methylene chloride/methanol to afford 167c as a brown solid (2.7 g, 60%). MS: [M+H]+ 206. 1H NMR (500 MHz, CDCl3) δ 11.51 (s, 1H), 6.45 (s, 1H), 4.16 (q, J=6.5 Hz, 2H), 3.26-3.24 (m, 2H), 1.82-1.79 (m, 2H), 1.74-1.72 (m, 2H), 1.24 (t, J=6.5 Hz, 3H), 0.91-0.89 (m, 2H).

1. temperatureafter cooling down to room temperature
2. extractionthe resulting mixture was extracted with methylene chloride (3×50 mL)
3. dry with materialThe combined organic phase was dried over Na2SO4
4. customevaporated under reduced pressure to dryness
5. customThe residue was purified by silica-gel column chromatography
6. washeluting with 20:1 methylene chloride/methanol