Reacción #218597

Ecuación de reacción

hydrogen

sodium bicarbonate

sodium hydride

N-(tert-butoxycarbonyl)-L-serine

3-bromo-2-methyl-propene

→

title compound

Rendimiento 100.0%

2-(R)-tert-Butoxycarbonylamino-3-(2-methyl-allyloxy)-propionic acid

Rendimiento 100.0%

Disolventes

—

hexanes

DMF

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaCool in an ice bath
2. 2
   LavadoWash twice with ethyl acetate
3. 3
   LavadoWash the organic layer with water
4. 4
   Secadodry (Na2SO4)
5. 5
   Concentraciónconcentrate

Procedimiento

Wash a 60% dispersion of sodium hydride in mineral oil (4.4 g, 115 mmol) with hexanes. Add DMF (30 mL), and cool in an ice bath. Add dropwise a solution N-(tert-butoxycarbonyl)-L-serine (10.0 g, 49 mmol) in DMF (160 mL). Warm to room temperature and stir until hydrogen evolution ceases after one hour. Cool in an ice bath and add 3-bromo-2-methyl-propene (7.40 g, 55 mmol). Stir for 2 hours. Pour mixture onto 5% aqueous sodium bicarbonate (800 mL). Wash twice with ethyl acetate. Add ethyl acetate (200 mL), and acidify the aqueous layer in its presence to pH=3 with concentrated hydrochloric acid. Wash the organic layer with water, dry (Na2SO4), and concentrate to afford the title compound as a clear oil (12.7 g): 1H NMR (CDCl3) δ 1.45 (s, 9H), 1.70 (s, 3H), 3.65 (m, 1H), 3.85 (m, 1H), 3.86-3.94 (m, 2H), 4.44 (m, 1H), 4.89 (s, 1H), 4.93 (s, 1H), 5.43 (d, 1H).

Fuente