反应详情

To a solution of 5-(3,5-dimethylbenz[d]isoxazol-6-yl)pyrazine-2-ylamine (109) (7.5 mg, 0.03 mmol) in 1 ml DCM was added 2,6-difluorobenzoyl chloride (11 μl, 0.09 mmol) followed by addition of DIEA (47 μl). The resulting solution was stirred at r.t. for 2 h. The reaction mixture was worked up with aq. NaHCO3/DCM. DCM phase was washed with brine, concentrated to dryness. The residue was dissolved in 2 ml THF/MeOH/H2O (5:4:1) and stirred with 1N NaOH (90 μl) at r.t. for 1 h before worked up with EA/aq. NaHCO3. Silica gel flash chromatography furnished 7.3 mg (yield: 63.8%, purity>95%) (2,6-difluorophenyl)-N-[5-(3,5-dimethylbenzo[d]isoxazol-6-yl)pyrazin-2-yl]carboxamide (110) as white solid.

1. washDCM phase was washed with brine
2. concentrationconcentrated to dryness
3. dissolutionThe residue was dissolved in 2 ml THF/MeOH/H2O (5:4:1)
4. stirringstirred with 1N NaOH (90 μl) at r.t. for 1 h