Triethylamine → (S)-N-CBZ-valinol

To a solution of L-valinol (2.00 g, 19.4 mmol) in methylene chloride (60 ml) were added chloroformic acid benzyl ester (3.32 ml, 23.3 mmol) and triethylamine (3.27 ml, 23.3 mmol) in an ice bath, and the mixture was stirred at room temperature for 4.5 hours. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution. The obtained organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (2:1→1:2) as the eluant to afford [(1S)-1-(hydroxymethyl)-2-methylpropyl]carbamic acid benzyl ester (4.56 g, yield 99%) as white crystals.

1. customthe completion of the reaction
2. customthe reaction mixture was partitioned between ethyl acetate and saturated aqueous sodium hydrogencarbonate solution
3. washThe obtained organic layer was washed with saturated aqueous sodium chloride solution
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by chromatography on a silica gel column

ORD record

ord-fa9886bd4afe489aae42aacee4ad114f

Source dataset

uspto-grants-2006_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07001897B2