反应详情

温度

105 °C

To a solution of 334b (5.0 g, 22 mmol) in DMSO (30 mL) was added NaN3 (2.2 g, 33 mmol) and the mixture was heated at 105° C. for 6 hours. Water (13 mL) was added to reaction the mixture after cooling down to room temperature, and resulting mixture was extracted with methylene chloride (50 mL×3). The organic phase was dried (Na2SO4) and evaporated to dryness. The residue was purified by column chromatography eluting with 20:1 methylene chloride/methanol to give 334c as a brown solid (2.7 g, 60%). MS: [M+H]+ 206. 1H NMR (500 MHz, CDCl3) δ 11.51 (s, 1H), 6.45 (dd, 1H), 4.14-4.19 (m, 2H,), 3.25 (d, 2H,), 1.79-1.82 (m, 2H), 1.73 (d, 1H), 1.22-1.25 (t, J=6.5, 3H), 0.89-0.91 (m, 2H).

1. temperatureafter cooling down to room temperature
2. customresulting mixture
3. extractionwas extracted with methylene chloride (50 mL×3)
4. dry with materialThe organic phase was dried (Na2SO4)
5. customevaporated to dryness
6. customThe residue was purified by column chromatography
7. washeluting with 20:1 methylene chloride/methanol