Reaktion #5703

Reaktionsgleichung

acetyl chloride

α-[3-(trifluoromethyl)benzylamino]-1-benzylindole-3-acetic acid

NaHCO3

NaHCO3

HCl

→

title compound

Methyl α-[3-(trifluoromethyl)benzylamino]-1-benzylindole-3-acetate

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeformed a dark
2. 2
   workup.STIRRINGAfter stirring for 22 hours the reaction mixture
3. 3
   Extraktionextracted twice with ether
4. 4
   WaschenThe combined organic extracts were washed with saturated NaHCO3 (1×75 mL), saturated brine (1×100 mL)
5. 5
   Trocknendried with anhydrous NaSO4
6. 6
   Einengenconcentrated in vacuo

Vorschrift

To a magnetically stirred solution of 100 ml of methanol cooled in an ice-acetone bath at ca. -15° C., was treated dropwise with acetyl chloride (27.3 g, 350 mmol, 35 eq) over a six-minute period as a convenient way to generate HCl in situ. The solution was stirred at ambient temperature for 45 minutes, then solid α-[3-(trifluoromethyl)benzylamino]-1-benzylindole-3-acetic acid was added which formed a dark rose colored solution. After stirring for 22 hours the reaction mixture was poured into 100 mL of saturated NaHCO3 solution containing 100 mL of crushed ice, basified with additional solid NaHCO3 powder until the rose color dissipated and extracted twice with ether. The combined organic extracts were washed with saturated NaHCO3 (1×75 mL), saturated brine (1×100 mL), dried with anhydrous NaSO4 and concentrated in vacuo. Flash chromatography with 100 g of silica gel using ethyl acetate-hexane (1:2) afforded 4.07 g of the title compound as a golden oil.

Quelle