[CH2:1]([C:3]1[C:15]([CH2:16][CH2:17][NH2:18])=[C:6]2[C:7]3[CH:13]=[C:12]([CH3:14])[O:11][C:8]=3[CH:9]=[CH:10][N:5]2[N:4]=1)[CH3:2].C(N(CC)CC)C.[C:26](Cl)(=[O:28])[CH3:27].C(=O)([O-])O.[Na+]>O1CCCC1>[CH2:1]([C:3]1[C:15]([CH2:16][CH2:17][NH:18][C:26](=[O:28])[CH3:27])=[C:6]2[C:7]3[CH:13]=[C:12]([CH3:14])[O:11][C:8]=3[CH:9]=[CH:10][N:5]2[N:4]=1)[CH3:2]To a solution of 2-(2-ethyl-8-methylfuro[3,2-c]pyrazolo[1,5-a]pyridin-1-yl)ethanamine (100 mg, 0.411 mmol) and triethylamine (85.9 μL, 0.616 mmol) in tetrahydrofuran (4 mL) was added acetyl chloride (58.3 μL, 0.617 mmol) under ice-cooling, and the mixture was stirred at room temperature for 10 min. A saturated aqueous sodium hydrogen carbonate solution (100 μL) was added and the mixture was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methanol/ethyl acetate=0/100→5/95) and recrystallization (ethyl acetate/hexane) to give the title compound (59.7 mg, yield 51%).
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