反应详情

温度

45 °C

Methanesulfonic acid 4-oxo-5-[5-(7-trifluoromethyl-quinolin-4-yloxy)-pentyloxy]-4H-pyran-2-ylmethyl ester 18 (123 mg, 0.215 mmol) was dissolved in dichloromethane (5 mL). 1-Methyl-piperazine (60 μL, 0.54 mmol) was added via syringe. The mixture was stirred at 45° C. for 2 h. After cooling to room temperature CH2Cl2 (75 ml) was added and the mixture was washed with NaHCO3 10% (3×50 mL) and brine (3×50 mL). The organic layer was dried over MgSO4, filtered and evaporated. The crude product was purified by column chromatography on silica using as eluent CH2Cl2:MeOH=9:1. 4-[5-(6-(4-Methyl-piperazin-1-ylmethyl)-4-oxo-4H-pyran-3-yloxy)-pentyloxy]-7-trifluoromethyl-quinoline-3-carboxylic acid ethyl ester EHT 8791 was obtained (38 mg, 31% yield) as a yellow oil.

1. additionwas added
2. washthe mixture was washed with NaHCO3 10% (3×50 mL) and brine (3×50 mL)
3. dry with materialThe organic layer was dried over MgSO4
4. filtrationfiltered
5. customevaporated
6. customThe crude product was purified by column chromatography on silica using as eluent CH2Cl2