Diisopropylethylamine → N-[(1S,2R)-1-benzyl-2-hydroxy-3-{[3-(trifluoromethyl)benzyl]amino}propyl]-1-oxo-2-(1-propylbutyl)-1,2,3,4-tetrahydroisoquinoline-5-carboxamide

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Reaction Steps

43 mg of 1-oxo-2-(1-propylbutyl)-1,2,3,4-tetrahydroisoquinoline-5-carboxylic acid are dissolved in 2.5 cm3 of dichloromethane under an inert atmosphere at a temperature close to 20° C. 62 mg of (2R,3S)-3-amino-4-phenyl-1-{[3-(trifluoromethyl)benzyl]amino}butan-2-ol hydrochloride (2:1), 3 mg of hydroxybenzotriazole and 34 mg of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to the solution. 0.124 cm3 of N,N-diisopropylethylamine is poured into the reaction medium. This medium is kept stirring for 20 h at a temperature close to 20° C. 10 cm3 of dichloromethane are added to the reaction mixture, then 10 cm3 of water. After decantation, the organic phase is washed with 5 cm3 of a saturated aqueous solution of sodium chloride, dried over magnesium sulfate and concentrated using a rotary evaporator under reduced pressure (5 kPa). The 100 mg of colorless oil obtained are purified by flash chromatography over silica (column: 7 g; particle size: 20-40 μm spherical; flow rate: 20 cm3/min; eluent: 100% ethyl acetate). After concentrating the fractions under reduced pressure, 40 mg of N-[(1S,2R)-1-benzyl-2-hydroxy-3-{[3-(trifluoromethyl)benzyl]amino}propyl]-1-oxo-2-(1-propylbutyl)-1,2,3,4-tetrahydroisoquinoline-5-carboxamide are obtained in the form of a colorless oil.

Provenance & Evidence