Reaktion #1176147

Reaktionsgleichung

ammonia

methanesulfonyl chloride

(2S,4R)-2-(1-carboxy-1-methylethyl)oxymethyl-4-hydroxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

triethylamine

→

(2S,4R)-2-(1-carbamoyl-1-methylethyl)oxymethyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

Lösungsmittel

ethanol

ethyl acetate

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe mixture was stirred at the same temperature for 1 hour
2. 2
   EinengenThe mixture was concentrated under reduced pressure
3. 3
   Sonstigeto give a residue
4. 4
   Waschenwashed with water (50 ml)
5. 5
   Trocknendried over magnesium sulfate
6. 6
   Einengenconcentrated under reduced pressure
7. 7
   Sonstigeto give a syrup
8. 8
   Wascheneluted with a mixture of methanol and chloroform (1:99 V/V)

Vorschrift

A solution of methanesulfonyl chloride (0.4 ml) in tetrahydrofuran (2 ml) was dropwise added to a solution of (2S,4R)-2-(1-carboxy-1-methylethyl)oxymethyl-4-hydroxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (0.84 g) and triethylamine (1 ml) in tetrahydrofuran (8 ml) at -10°~-5° C. and the mixture was stirred at the same condition for 30 minutes. The mixture was dropwise added to a 10% solution (20 ml) of ammonia in ethanol and the mixture was stirred at the same temperature for 1 hour. The mixture was concentrated under reduced pressure to give a residue. The residue was dissolved in ethyl acetate (50 ml), washed with water (50 ml), dried over magnesium sulfate and concentrated under reduced pressure to give a syrup. The syrup was subjected to a column chromatography on silica gel (20 g) and eluted with a mixture of methanol and chloroform (1:99 V/V) to give (2S,4R)-2-(1-carbamoyl-1-methylethyl)oxymethyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (1.01 g).

Quelle