反应详情

To a solution of 6-(trifluoromethyl)-2-pyridinecarboxylic acid (ref: European Journal of Organic Chemistry (2003), (8), 1569-1575) (0.032 g, 0.169 mmol) in 2 mL of MeCN was added DIEA (0.022 g, 0.169 mmol) and HATU (0.064 g, 0.169 mmol). After stirring at rt for 2 min, (1Z)-2-[5-cyano-2-methyl-4-(trifluoromethyl)-1H-indol-1-yl]-N-hydroxyethanimidamide (0.050 g, 0.169 mmol) was added. After stirring at rt for 30 min, the mixture was heated in a sealed tube at 150° C. for 1.5 h. Upon cooling, the mixture was concentrated to dryness and the residue was purified by silica gel chromatography using a 5-50% EtOAc-hexanes gradient. The product was crystallized from CH2Cl2-hexanes to afford the title compound as a white solid (0.035 g, 46% yield): MS (ES) m/z 452 (M+1).

1. stirringAfter stirring at rt for 30 min
2. temperaturethe mixture was heated in a sealed tube at 150° C. for 1.5 h
3. temperatureUpon cooling
4. concentrationthe mixture was concentrated to dryness
5. customthe residue was purified by silica gel chromatography
6. customThe product was crystallized from CH2Cl2-hexanes