Reaktion #11439

Reaktionsgleichung

Tert-butyl 4-aminobutylcarbamate

2,4-dichloro-5,6-dimethyl-3-nitropyridine

N,N-dimethylformamide

triethylamine

→

tert-butyl 4-(2-chloro-5,6-dimethyl-3-nitropyridin-4-yl)butylcarbamate

Ausbeute 79.8%

Lösungsmittel

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Einengenit was concentrated under reduced pressure
2. 2
   Sonstigeto provide an oil
3. 3
   Waschenwashed with water
4. 4
   TrocknenThe organic layer was dried over magnesium sulfate
5. 5
   Einengenconcentrated under reduced pressure
6. 6
   Sonstigeto provide a dark oil
7. 7
   SonstigeThis material was purified by column chromatography (silica gel eluting with 40/60 ethyl acetate/hexanes)

Vorschrift

Tert-butyl 4-aminobutylcarbamate (60 g, 339 mmol) was slowly added to a mixture of 2,4-dichloro-5,6-dimethyl-3-nitropyridine (50 g, 226 mmol), anhydrous N,N-dimethylformamide (500 mL) and triethylamine (50 mL, 339 mmol). The reaction mixture was allowed to stir overnight and then it was concentrated under reduced pressure to provide an oil. The oil was dissolved in ethyl acetate and then washed with water. The organic layer was dried over magnesium sulfate and then concentrated under reduced pressure to provide a dark oil. This material was purified by column chromatography (silica gel eluting with 40/60 ethyl acetate/hexanes) to provide 64.5 g of tert-butyl 4-(2-chloro-5,6-dimethyl-3-nitropyridin-4-yl)butylcarbamate as a bright orange oil which solidified on standing.

Quelle