反应详情

A solution of compound 147-C (0.36 g, 2.00 mmol), N,N-diisopropylethylamine (0.385 mL, 2.21 mmol) and diphenyl phosphoryl azide (0.536 mL, 2.41 mmol) in t-butanol (3.6 mL) was heated at reflux for 16 h. The solvent was evaporated in vacuo, the residue dissolved in dichloromethane, washed with 1 N NaOH, brine, dried with Na2SO4, filtered, and evaporated to afford a residue. Flash column chromatography (SiO2) eluting with dichloromethane afforded compound 147-D as a white solid (0.25 g, 50%). 1H-NMR (CDCl3): δ 1.55 (s, 9H), 6.60 (s, 1H), 7.20 (dd, 1H), 7.80 (d, 1H), 8.40 (d, 1H); MS: m/z 251.2 (MH+).

1. temperatureat reflux for 16 h
2. customThe solvent was evaporated in vacuo
3. dissolutionthe residue dissolved in dichloromethane
4. washwashed with 1 N NaOH, brine
5. dry with materialdried with Na2SO4
6. filtrationfiltered
7. customevaporated
8. customto afford a residue
9. washFlash column chromatography (SiO2) eluting with dichloromethane afforded compound 147-D as a white solid (0.25 g, 50%)