反应详情

To a solution of 5-bromo-2-methylpent-2-ene (1.33 mL, 10.0 mmol) in CH3CN (25 mL) was added tert-butyl hydroxycarbamate (2.0 g, 15.0 mmol) and DBU (4.5 mL, 30 mmol) at 0° C. and the reaction mixture stirred at r.t. for overnight. Quenched with saturated NH4Cl solution and extracted with brine. Combined organic layers washed with brine and dried over anhydrous Na2SO4, filtered and concentrated to provide yellow oil, which was purified by flash chromatography (50% EtOAc-hexane) to yield tert-butyl 4-methylpent-3-enyloxycarbamate (750 mg, 70%) as a viscous oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.40 (s, 9H) 1.54 (s., 3H) 1.61 (s., 3H) 2.21-2.31 (m, 2H) 3.70-3.78 (m, 2H) 5.02-5.10 (m, 1H). MS (ES) [M+H] calculated for C11H22NO3, 216.15; found 216.10.

1. customQuenched with saturated NH4Cl solution
2. extractionextracted with brine
3. washCombined organic layers washed with brine
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto provide yellow oil, which
8. customwas purified by flash chromatography (50% EtOAc-hexane)