Reacción #79481

Ecuación de reacción

Ethyl acetate

2,3-Dihydro-benzo[1,4]dioxin-5-ylamine

2-chloroethanol

Hunigs base

→

crude product

Rendimiento 80.0%

2-[(2,3-Dihydro-benzo[1,4]dioxin-5-yl)-(2-hydroxy-ethyl)-amino]-ethanol

Rendimiento 80.0%

Condiciones de reacción

Tratamiento posterior

1. 1
   Lavadothe solution is washed with diluted brine (1×250 mL)
2. 2
   Lavadois back-washed with ethyl acetate (2×100 mL)
3. 3
   Extracciónextracted with 2N HCl (3×150 mL)
4. 4
   Extracciónextracted with ethyl acetate (3×100 mL)
5. 5
   SecadoThe organic phase is dried with MgSO4
6. 6
   Concentraciónconcentrated
7. 7
   Otroto remove residual chloroethanol

Procedimiento

2,3-Dihydro-benzo[1,4]dioxin-5-ylamine (31.1 g, 0.2 mol) is mixed with 2-chloroethanol (210 mL, 3.1 mol) and Hunigs base (105 mL, 0.6 mol). The resulting dark solution is heated to 120° C. and stirred at this temperature with continuous monitoring by HPLC. After 12.5 h, the reaction is stopped. Ethyl acetate (300 mL) is added and the solution is washed with diluted brine (1×250 mL) followed by brine (2×75 mL). All aqueous layers are combined, the pH adjusted to 7 with K2CO3, and solution is back-washed with ethyl acetate (2×100 mL). All organic layers are then combined and extracted with 2N HCl (3×150 mL). The resulting aqueous solution is neutralized with solid K2CO3 to pH 7 and extracted with ethyl acetate (3×100 mL). The organic phase is dried with MgSO4, concentrated and chased with toluene (2×50 mL) to remove residual chloroethanol. 39.6 g (80%) of crude product is obtained as a dark oil of 94 area % (LC-MS) purity. 1H NMR (CDCl3) δ6.88-6.70 (m, 3H), 4.34-4.22 (m, 4H), 3.54 (t, J=7.5 Hz, 4H), 3.18 (t, J=7.5 Hz, 4H).

Fuente