反应详情

A dispersion of sodium azide (0.90 g, 13.84 mmol) and 1-(tert-butyl)-2-methyl (2S,4S)-4-bromotetrahydro-1H-1,2-pyrroledicarboxylate (4) (1.0 g, 3.24 mmol) in anhydrous dimethylformamide (32 mL) was heated for 64 h under an atmosphere of nitrogen. The mixture was cooled to room temperature, poured into ice-cold water and extracted with ethyl acetate. The organic extracts were combined, washed with water and brine, dried (MgSO4) and evaporated under reduced pressure. The crude product was purified by silica gel column chromatography eluting with hexane-ethyl acetate (3:1 to 1:1, v/v) to give the title azide (5) (0.88 g, 93%) as a pale yellow oil:

1. additionpoured into ice-cold water
2. extractionextracted with ethyl acetate
3. washwashed with water and brine
4. dry with materialdried (MgSO4)
5. customevaporated under reduced pressure
6. customThe crude product was purified by silica gel column chromatography
7. washeluting with hexane-ethyl acetate (3:1 to 1:1