Reaktion #1960731

Reaktionsgleichung

5-Cyano-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide

5-cyano-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide

ethyl iodide

lithium hexamethyldisilazide

→

5-cyano-5-ethyl-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide

Ausbeute 48.1%

Lösungsmittel

tetrahydrofuran

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction mixture was reacted at room temperature for 2 hours
2. 2
   Extraktionextracted with ethyl acetate (200 mL×3)
3. 3
   TrocknenThe combined organic extracts were dried over anhydrous sodium sulfate
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated under reduced pressure
6. 6
   Sonstigeto obtain an oil
7. 7
   Sonstigethe oil was purified by silica gel column chromatography

Vorschrift

5-Cyano-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 12a (3.0 g, 14.5 mmol) was dissolved in 60 mL of tetrahydrofuran with stirring followed by addition of ethyl iodide (4.52 g, 29 mmol) and lithium hexamethyldisilazide (29 mL, 29 mmol) under nitrogen atmosphere. The reaction mixture was reacted at room temperature for 2 hours. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was diluted with 20 mL of water and extracted with ethyl acetate (200 mL×3). The combined organic extracts were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain an oil. TLC showed that there are two adjacent spots, and then the oil was purified by silica gel column chromatography to obtain the title compound 5-cyano-5-ethyl-hexahydro-cyclopenta[c]pyrrole-2-carboxylic acid dimethylamide 19a (1.64 g) as a light yellow solid.

Quelle