Diisopropylethylamine → tert-Butyl 6-(2-(1-(4-amino-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-1-yl)-2-methylpropan-2-yloxy)ethylamino)-6-oxohexylcarbamate

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반응 단계

6-(tert-Butoxycarbonylamino)hexanoic acid (197 mg, 850 μmol) was combined with DMF (10.9 mL) to give a colorless solution. O-(Benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU, 300 mg, 936 μmol) and N,N-diisopropylethylamine (DIEA, 728 μl, 4.25 mmol) were added with stirring in an inert atmosphere. Then 1-(2-(2-aminoethoxy)-2-methylpropyl)-2-(ethoxymethyl)-1H-imidazo[4,5-c]quinolin-4-amine (Example 1c, 304 mg, 850 μmol) was added and the mixture was stirred for 2 hours at room temperature. The mixture was concentrated in vacuo, dissolved in ethyl acetate (5 mL), stirred for 1 min with cold sodium hydroxide solution (1 N) and dried by passing through ChemElut® (10 g). The organic phase was concentrated in vacuo again and the residue was purified by flash chromatography (silica gel, 10% methanol in dichloromethane) to give the title compound (0.135 g, 23%) as light brown oil; LC-MS (UV peak area, ESI) 83%, 571.5 (MH+).

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