1-Hydroxybenzotriazole → HCID 56986282, compound

Participants

Reaction Steps

Subsequently, under ice-cooled condition, to 9.3 g (37 mmol) of phenylmethyl (2RS,3S)-3-amino-2-hydroxyheptanoate, 9.5 g (37 mmol) of 1-[N-(morpholine-4-carbonyl)amino]cyclohexanecarboxylic acid synthesized in Reference Example 5 and 6.0 g (45 mmol) of 1-hydroxybenzotriazole in 100 ml of dichloromethane, 8.5 g (45 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride was added and then was stirred at the room temperature for 18 hours. The reaction solution was concentrated under reduced pressure. The residue was washed successively with water, aqueous solution of 10% of potassium hydrogensulfate, aqueous solution of saturated sodium hydrogen-carbonate and saturated brine in addition of ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and the solvent was distilled away from the reaction mixture under reduced pressure. The residue was purified by the silicagel column chromatography, whereby 16.8 g of phenylmethyl (2RS,3S)-2-hydroxy-3-[N-[1-[N-(morpholine-4-carbonyl)amino]cyclohexanecarbonyl]amino]heptanoate was obtained.

Provenance & Evidence