1,2-Dichloroethane → HCID 7033973, Verbindung

Temperatur

0 °C

Nα -Benzyloxycarbonyl-L-phenylalanine (4.95 g, 16.5 mmol) was dissolved in dichloromethane (70 ml) and the solution was cooled to 0° C. and stirred during the addition of pentafluorophenol (3.35 g, 18.2 mmol), followed by EDC (3.49 g, 18.2 mmol). The mixture was allowed to warm to room temperature, stirred for a further 1 hour then cooled back to 0° C. Aniline (3.85 g, 41.4 mmol) was added dropwise and the mixture was warmed to room temperature then stirred overnight. The solution was washed twice with 1M sodium carbonate, twice with 1M hydrochloric acid and finally with brine before drying over anhydrous magnesium sulphate. The solution was filtered and evaporated to a white solid which was recrystallised from ethyl acetate-hexane. Yield: 2.57 g (41%). 1H-NMR; δ (CDCl3), 7.87 (1H, br s), 7.43-7.03 (15H, br m), 5.62 (1H, m), 5.08 (2H, s), 4.59 (1H, s) and 3.15 (2H, s).

1. temperatureto warm to room temperature
2. temperaturethen cooled back to 0° C
3. temperaturethe mixture was warmed to room temperature
4. stirringthen stirred overnight
5. washThe solution was washed twice with 1M sodium carbonate, twice with 1M hydrochloric acid and finally with brine
6. dry with materialbefore drying over anhydrous magnesium sulphate
7. filtrationThe solution was filtered
8. customevaporated to a white solid which
9. customwas recrystallised from ethyl acetate-hexane

ORD-Eintrag

ord-aea4004d8f2b43cdb77241c43125be1d

Quelldatensatz

uspto-grants-1998_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05747514