[CH3:1][C:2]1[O:3][C:4]2[CH:10]=[C:9]([C:11]3[CH:12]=[CH:13][C:14]([NH2:17])=[N:15][CH:16]=3)[C:8]([CH3:18])=[CH:7][C:5]=2[N:6]=1.[Cl:19][C:20]1[CH:28]=[CH:27][CH:26]=[CH:25][C:21]=1[C:22](Cl)=[O:23].CCN(C(C)C)C(C)C.C([O-])(O)=O.[Na+].C(Cl)Cl>C(Cl)Cl>[CH3:1][C:2]1[O:3][C:4]2[CH:10]=[C:9]([C:11]3[CH:12]=[CH:13][C:14]([NH:17][C:22]([C:21]4[CH:25]=[CH:26][CH:27]=[CH:28][C:20]=4[Cl:19])=[O:23])=[N:15][CH:16]=3)[C:8]([CH3:18])=[CH:7][C:5]=2[N:6]=1To a solution of 5-(2,5-dimethylbenzoxazol-6-yl)-2-pyridylamine (49) (42 mg, 0.175 mmol) in 2 ml DCM was added 2-chlorobenzoyl chloride (44 μl, 2 eq) followed by addition of DIEA (153 μl). The resulting solution was stirred at r.t. for 3 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 (350 μl) at r.t. for 4 h before worked up with EA/aq. NaHCO3. Silica gel flash chromatography furnished 47.7 mg N-[5-(2,5-dimethylbenzoxazol-6-yl)(2-pyridyl)](2-chlorophenyl)carboxamide (50) as white solid. (yield: 72.1%).
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