ethyl 2-methyl-1H-indole-3-carboxylate → Ethyl 3,5-dimethylisonicotinate
反応式
[CH3:1][C:2]1[NH:3][C:4]2[C:9]([C:10]=1[C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:8]C=CC=2.[CH3:16][Al](C)C>O1CCOCC1>[CH3:8][C:9]1[CH:4]=[N:3][CH:16]=[C:2]([CH3:1])[C:10]=1[C:11]([O:13][CH2:14][CH3:15])=[O:12]参加物
4
実験手順
To a solution of ethyl 2-methyl-1H-indole-3-carboxylate (2 g, 6.15 mmol), Pd(PPh3)-4(0.36 g, 0.31 mmol) in dioxane (20 mL) was added Me3Al (2 M in THF, 7.69 ml, 15.37 mmol) under N2. The mixture was stirred at reflux overnight. After the complete of the reaction, the reaction was quenched by addition of 5 mL of water and extracted with EtOAc. The extractions were combined, washed with H2O, dried over Na2SO4, and concentrated under vacuum. The residue was purified by flash column (Eluent: PE/EtOAc=15:1) to give ethyl 3,5-dimethylisonicotinate as a yellow solid. (0.9 g, yield 78%). LRMS (M+H+) m/z: calcd 180.2. found 179.01.