Reaktion #818435

Reaktionsgleichung

2-oxo-cyclopentanecarboxylic acid ethyl ester

benzylamine

sodium cyanoborohydride

→

2-benzylamino-cyclopentanecarboxylic acid ethyl ester

Ausbeute 44.2%

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to 25° C. the solvent
2. 2
   Sonstigewas removed in vacuo
3. 3
   workup.DISSOLUTIONthe crude material was redissolved in ethyl acetate (100 mL)
4. 4
   Waschenwashed with saturated aqueous sodium bicarbonate solution (100 mL)
5. 5
   Waschenthe organic layer was washed with 1.0 M aqueous hydrochloric acid solution (50 mL)
6. 6
   workup.ADDITION1.0 M aqueous sodium hydroxide solution (75 mL) was added
7. 7
   Extraktionthe aqueous layer was extracted with ethyl acetate (100 mL)
8. 8
   TrocknenThe organic layer was dried over sodium sulfate
9. 9
   Filtrationfiltered
10. 10
    Sonstigethe solvent was removed in vacuo

Vorschrift

A solution of 2-oxo-cyclopentanecarboxylic acid ethyl ester (3.00 g, 19.2 mmol) in ethanol (20 mL) was treated with benzylamine (2.10 mL, 19.2 mmol), sodium cyanoborohydride (2.42 g, 38.4 mmol), glacial acetic acid (10 drops) and stirred for 16 h at 50° C. After cooling to 25° C. the solvent was removed in vacuo, the crude material was redissolved in ethyl acetate (100 mL) and washed with saturated aqueous sodium bicarbonate solution (100 mL). The aqueous layer was discarded and the organic layer was washed with 1.0 M aqueous hydrochloric acid solution (50 mL). The organic layer was discarded, 1.0 M aqueous sodium hydroxide solution (75 mL) was added and the aqueous layer was extracted with ethyl acetate (100 mL). The organic layer was dried over sodium sulfate, filtered and the solvent was removed in vacuo to afford the desired product, 2-benzylamino-cyclopentanecarboxylic acid ethyl ester (2.10 g, 8.49 mmol, 44.2%), as a light yellow oil. LC-MS (ESI) calcd for C15H21NO2 247.16, found 248.2 [M+H+].

Quelle