Dicyclohexylcarbodiimide → HCID 21571524, compound

Temperature

0 °C

50 mg of L-N-[(2S or R)-3-(2-hydroxyethyl)sulfonyl-2-(1-naphthylmethyl)propionyl]norleucine was dissolved in 0.2 ml of dry DMF, and 28.2 mg of 1-hydroxybenzotriazole and 33.2 mg of DCC were added thereto at 0° C. under stirring. Then, 55.2 mg of (2RS,3R,4S)-4-amino-5-cyclohexyl-1-morpholino-2,3-pentanediol dihydrochloride was dissolved in 0.2 ml of dry DMF, and 31.1 mg of triethylamine was added thereto for neutralization. This mixture was added to the previous reaction solution, and the mixture was stirred at 0° C. for two hours and at room temperature overnight. The precipitated dicyclohexyl urea was removed by filtration, and the filtrate was diluted with 10 ml of ethyl acetate. The ethyl acetate layer was washed sequentially with a 4% sodium hydrogencarbonate aqueous solution, with water and with a saturated sodium chloride aqueous solution and dried over anhydrous sodium sulfate. Then, the solvent was distilled off. The residue was purified by silica gel column chromatography (chloroform/methanol= 20/1) to obtain 20.1 mg of (2S,3R,4S)-4-{L-N-[(2S or R)-3-(2-hydroxyethyl)sulfonyl-2-(1-naphthylmethyl)propionyl]norleucyl}amino-5-cyclohexyl-1-morpholino-2,3-pentanediol as colorless

1. additionThis mixture was added to the previous reaction solution
2. stirringthe mixture was stirred at 0° C. for two hours and at room temperature overnight
3. customThe precipitated dicyclohexyl urea was removed by filtration
4. additionthe filtrate was diluted with 10 ml of ethyl acetate
5. washThe ethyl acetate layer was washed sequentially with a 4% sodium hydrogencarbonate aqueous solution, with water and with a saturated sodium chloride aqueous solution
6. dry with materialdried over anhydrous sodium sulfate
7. distillationThen, the solvent was distilled off
8. customThe residue was purified by silica gel column chromatography (chloroform/methanol= 20/1)

ORD record

ord-d9ee54ae7ed149eaaf81f497888000e7

Source dataset

uspto-grants-1992_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05122523