Reaktion #45909

Reaktionsgleichung

borane tetrahydrofuran

tert-Butyl {(3S)-3-methyl-5-oxo-1-[(1R)-1-phenylethyl]pyrrolidin-3-yl}carbamate

Ethanol

triethylamine

→

compound

Ausbeute 85.0%

tert-Butyl {(3S)-3-methyl-1-[(1R)-1-phenylethyl]pyrrolidin-3-yl}carbamate

Ausbeute 85.0%

Lösungsmittel

tetrahydrofuran

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   workup.STIRRINGby stirring in an oil bath at 90° C. for 3 hours
3. 3
   SonstigeThe reaction liquid
4. 4
   Einengenwas concentrated under reduced pressure
5. 5
   workup.DISSOLUTIONdissolved in ethyl acetate
6. 6
   Waschenwashed with an aqueous saturated sodium hydrogencarbonate solution and saturated brine
7. 7
   TrocknenAfter drying over anhydrous sodium sulfate
8. 8
   Sonstigethe insoluble matter was separated by filtration
9. 9
   Sonstigethe residue obtained by concentration
10. 10
    Sonstigewas purified by silica gel column chromatography (eluent, n-hexane

Vorschrift

tert-Butyl {(3S)-3-methyl-5-oxo-1-[(1R)-1-phenylethyl]pyrrolidin-3-yl}carbamate (I-343) (500 mg, 1.57 mmol) was dissolved in tetrahydrofuran (15 ml), and with cooling with ice, borane/tetrahydrofuran complex (1.2 mol/l tetrahydrofuran solution) (3.93 ml, 4.71 mmol) was added, followed by stirring at room temperature for 17 hours. Ethanol (12 ml), triethylamine (4 ml) and water (4 ml) were added to the reaction liquid, followed by stirring in an oil bath at 90° C. for 3 hours. The reaction liquid was concentrated under reduced pressure, dissolved in ethyl acetate, and washed with an aqueous saturated sodium hydrogencarbonate solution and saturated brine. After drying over anhydrous sodium sulfate, the insoluble matter was separated by filtration, and the residue obtained by concentration was purified by silica gel column chromatography (eluent, n-hexane:ethyl acetate=2:1→1:2, v/v) to obtain the entitled compound (406 mg, 85%) as a colorless oily substance.

Quelle