Ammonia → 3-[N-(t-butoxycarbonyl)-N-(2-cyclohexylethyl)amino]propionamide

Temperature

-78 °C

Next, anhydrous tetrahydrofuran (7 ml) was added to 3-[N-(t-butoxycarbonyl)-N-(2-cyclohexylethyl)amino]propionic acid (0.59 g, 2.0 mmol), and the mixture was stirred at −78° C. N-Methylmorpholine (0.22 ml, 2.0 mmol) and then a solution of isobutyl chloroformate (0.38 ml, 2.9 mmol) in tetrahydrofuran (3 ml) were added to the mixture. After one hour, a 28% aqueous ammonia solution (6.0 ml, 9.8 mmol) was added thereto, and the whole was stirred for 1.5 hours. Chloroform (50 ml) was added to the reaction mixture, the temperature was raised to room temperature, and the whole was washed with a saturated aqueous sodium hydrogencarbonate solution (20 ml) and saturated brine (20 ml) successively. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure, and the residue was purified by silica gel column chromatography to give 0.34 g (58%) of 3-[N-(t-butoxycarbonyl)-N-(2-cyclohexylethyl)amino]propionamide as colorless crystals.

1. stirringthe whole was stirred for 1.5 hours
2. temperaturethe temperature was raised to room temperature
3. washthe whole was washed with a saturated aqueous sodium hydrogencarbonate solution (20 ml) and saturated brine (20 ml) successively
4. dry with materialThe organic layer was dried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customthe residue was purified by silica gel column chromatography

ORD record

ord-ce5a3a506d31462fa58328770e3568d0

Source dataset

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07098226B2