Reaktion #69352

Reaktionsgleichung

HOBt

EDC

4-pentenoic acid

(R)-(−)-2-phenylglycinol

iPr2NEt

→

product

Ausbeute 64.0%

(R)-N-(2-hydroxy-1-phenylethyl)pent-4-enamide

Ausbeute 64.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwere subsequently added
2. 2
   Sonstigeconsumption of starting material
3. 3
   workup.ADDITIONThe reaction mixture was diluted with saturated NH4Cl and EtOAc
4. 4
   Sonstigethe layers separated
5. 5
   ExtraktionThe aqueous layer was extracted 2× with EtOAc
6. 6
   Waschenthe combined organic extracts were washed with 1 N HCl and brine
7. 7
   Trocknendried over Na2SO4
8. 8
   Filtrationfiltered
9. 9
   Einengenconcentrated
10. 10
    SonstigeThe crude product was purified

Vorschrift

To a solution of 4-pentenoic acid (2.55 mL, 25.0 mmol) in DMF (312 mL) cooled in an ice/water bath was added HOBt (3.37 g, 25.0 mmol) and EDC (4.79 g, 25.0 mmol) and the resulting solution was stirred for 30 min (R)-(−)-2-phenylglycinol (3.43 g, 25.0 mmol), iPr2NEt (17.8 mL, 100 mmol), and DMAP (0.305 g, 2.50 mmol) were subsequently added and the reaction mixture was stirred 16 h at which point LC-MS analysis indicated complete consumption of starting material. The reaction mixture was diluted with saturated NH4Cl and EtOAc and the layers separated. The aqueous layer was extracted 2× with EtOAc and the combined organic extracts were washed with 1 N HCl and brine, dried over Na2SO4, filtered, and concentrated. The crude product was purified using silica gel chromatography (MeOH/CH2Cl2 gradient) to yield 3.5 g of product as a colorless oil in 64% yield. LRMS (M+H)+: 220.1.

Quelle