Triethylamine → HCID 24986042, 화합물

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6-(4-(5-(Hydroxymethyl)-1H-1,2,4-triazol-3-yl)phenyl)-1-(2-(tetrahydro-2H-pyran-4-yl)ethyl)-1H-imidazo[4,5-b]pyrazin-2(3H)-one. Ethyl 4-(2-oxo-3-(2-(tetrahydro-2H-pyran-4-yl)ethyl)-2,3-dihydro-1H-imidazo[4,5-b]pyrazin-5-yl)benzimidate (See Example 195.B) (0.250 g, 0.63 mmol) in ethanol (20 mL) was treated with 2-hydroxyacetohydrazide (0.17 g, 1.9 mmol) and triethylamine (0.26 mL, 1.9 mmol), and the resulting reaction mixture was stirred in a sealed tube at 110° C. for 16 h. The cooled reaction solvent removed under reduced pressure. The resulting material was purified using reverse-phase semi-preparatory HPLC (15-50% acetonitrile+0.1% TFA in H2O+0.1% TFA, over 30 min). Fractions containing clean product were passed through a Phenomenex Strata-X-C ion exchange column to remove TFA. The column was washed successively with water, methanol, and then 5% ammonium hydroxide in methanol. The product came off with the 5% ammonium hydroxide in methanol eluent and was concentrated on a rotary evaporator. The residue was triturated with ethyl ether in hexane to make a fine powder and dried under vacuum at 50° C. to give the desired product (0.130 g, 49%) as a white solid. MS (ESI) m/z 422.3[M+1]+.

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