Aluminium lithium hydride → N-(cyclopentylmethyl)-N-ethylamine

Temperature

30 °C

N-Cyclopentenoyl-ethylamine was prepared from cyclopentenoic acid (2 grams, 17.5 mmol) and oxallyl chloride (2.2 grams, 17.5 mmol) after stirring at 25-35° C. for 8-12 hours. To this was added a benzene solution of ethylamine (2.1 grams, 48.7 mmol) at 0° C., and this reaction mixture was stirred for 3 hours at 25-35° C., after which time the solvent was evaporated under vacuum to yield N-cyclopentenoyl-ethylamine (1.7 grams), yield: 68.9%. A solution of N-cyclopentenoyl-ethylamine (1.7 grams, 13.3 mmol) in anhydrous tetrahydrofuran (THF) (10 mL) under a nitrogen atmosphere, and lithium aluminum hydride (LiAlH4; 1.3 grams, 36.1 mmol) was added to the solution. After being stirred for 1 hour at 25-35° C., the reaction mixture was gently refluxed for 8 hours. The reaction mixture was quenched with saturated sodium sulfate solution, filtered, and the precipitate washed with diethyl ether (Et2O). The filtrate was concentrated to afford N-cyclopentylmethyl ethylamine (0.6 g), yield: 40%.

1. temperaturethe reaction mixture was gently refluxed for 8 hours
2. customThe reaction mixture was quenched with saturated sodium sulfate solution
3. filtrationfiltered
4. washthe precipitate washed with diethyl ether (Et2O)
5. concentrationThe filtrate was concentrated

ORD record

ord-d472b82a45a14f2f81b4d49b282981d9

Source dataset

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09040558B2