Reaktion #2122485

Reaktionsgleichung

(2,4,6-trimethylphenyl)-acetyl chloride

4-hydroxy-1-methoxy-piperidine-4-carboxylic acid ethyl ester

4-dimethylaminopyridine DMAP

→

1-methoxy-4-[2-(2,4,6-trimethyl-phenyl)-acetoxy]-piperidine-4-carboxylic acid ethyl ester

Lösungsmittel

pyridine

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction mixture was warmed up to room temperature
2. 2
   workup.WAITleft
3. 3
   EinengenThen the reaction mixture was concentrated
4. 4
   workup.ADDITIONcold (0° C.) water was added
5. 5
   ExtraktionThe aqueous phase was thoroughly extracted three times with dichloromethane
6. 6
   Waschenwashed with brine
7. 7
   Trocknendried over sodium sulfate
8. 8
   Einengenconcentrated
9. 9
   SonstigeThe crude product was purified by column chromatography on silica gel (ethyl acetate/cyclohexane 1:4)

Vorschrift

To a solution of 4-hydroxy-1-methoxy-piperidine-4-carboxylic acid ethyl ester (0.5 g, 2.46 mmol) in 15 ml pyridine under argon was added 4-dimethylaminopyridine DMAP (0.11 g, 0.9 mmol). The solution was cooled down to 0° C., then (2,4,6-trimethylphenyl)-acetyl chloride (0.58 g, 2.95 mmol) was added dropwise. The reaction mixture was warmed up to room temperature and left stirring for 3 days. Then the reaction mixture was concentrated and cold (0° C.) water was added. The aqueous phase was thoroughly extracted three times with dichloromethane. The organic layers were combined, washed with brine, dried over sodium sulfate and concentrated. The crude product was purified by column chromatography on silica gel (ethyl acetate/cyclohexane 1:4) to give pure 1-methoxy-4-[2-(2,4,6-trimethyl-phenyl)-acetoxy]-piperidine-4-carboxylic acid ethyl ester (compound P3.6) as light yellow oil. Yield: 610 mg.

Quelle