反应详情

Lithium hydroxide monohydride (25 mg, 0.595 mmol) was added to a solution of 4-methyl-2-({6-[4-(2-trifluoromethylbenzoyl)piperazin-1-yl]pyridazine-3-carbonyl}-amino)pentanoic acid methyl ester (130 mg, 0.256 mmol) in tetrahydrofuran (3 mL) and water (1.5 mL), the reaction mixture was stirred at ambient temperature for 3 hours, THF was removed by evaporation, the residue was adjusted with 5% citric acid to pH about 6, and diluted with ethyl acetate, washed with water and brine, dried (Na2SO4) and concentrated to afford 4-methyl-2-({6-[4-(2-trifluoromethylbenzoyl)piperazin-1-yl]pyridazine-3-carbonyl}amino)pentanoic acid (94 mg, 74%). 1H NMR (400 MHz, CDCl3) δ 8.17, 8.02, 7.78, 7.66-7.53, 7.38, 6.99, 6.72, 4.88-4.73, 4.25-3.60, 3.44-3.21, 1.79-1.06, 1.33-1.19, 1.03, 0.99.

1. customTHF was removed by evaporation
2. additiondiluted with ethyl acetate
3. washwashed with water and brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated