Triethylamine → (S)-N-CBZ-valinol

Beteiligte Stoffe

Reaktionsschritte

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.

Herkunft & Nachweise