3-hydroxy-1,2,3-benzotriazin-4(3H)-one → tert-butyl 2-methyl-1-[(2R)-4-methyl-1-oxo-1-[2-oxo-8-(2-oxopyrrolidin-1-yl)-1-(thiophen-3-ylmethyl)-1,2,3,4-tetrahydroquinolin-3-ylamino]pentan-2-ylamino]-1-oxopropan-2-ylcarbamate

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Reaction Steps

3-Amino-8-(2-oxopyrrolidin-1-yl)-1-(thiophen-3-ylmethyl)-3,4-dihydroquinolin-2(1H)-one (200 mg) and (R)-2-(2-(tert-butoxycarbonylamino)-2-methylpropanamido)-4-methylpentanoic acid (200 mg) were dissolved in dichloromethane (2 mL), and to the solution was added dropwise a solution of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (126 mg), 3-hydroxy-4-oxo-3,4-dihydro-1,2,3-benzotriazine (107 mg), and triethylamine (42 μL) in dichloromethane (2 mL) over 10 minutes under cooling on ice, followed by stirring at room temperature for 18 hours. The solvent was evaporated, and the thus-recovered residue was dissolved in ethyl acetate. The solution was sequentially washed with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, and the organic layer was dried over sodium sulfate. The solvent was evaporated under reduced pressure, and the thus-recovered residue was purified through silica gel column chromatography (hexane:ethyl acetate (1:1), chloroform:methanol (10:1)), whereby the title compound (342 mg) was yielded.

Provenance & Evidence