反应详情

N1-Methyl-5-(2-amino-4-pyridyl)oxy-1H-1-indolecarboxamide (150 mg, 0.53 mmol) synthesized in Production example 5-1 was dissolved in tetrahydrofuran (3 ml). Triethylamine (0.37 ml, 2.66 mmol) and phenyl chlorocarbonate (0.15 ml, 1.2 mmol) were sequentially added dropwise at room temperature, and the reaction mixture was stirred for 30 minutes. 1-(2-Hydroxy-2-methylpropionyl)piperazine (412 mg, 2.39 mmol) and N,N-dimethylformamide (3 ml) were added and the reaction mixture was stirred for 3 days. The reaction mixture was partitioned between ethyl acetate and water. The organic layer was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was distilled off, and the residue was purified by silica gel column chromatography (eluent; ethyl acetate:methanol=95:5). The crystals were precipitated from diethyl ether-hexane (1:2), filtered off, and dried under aeration to yield the title compound (189.4 mg, 0.39 mmol, 74.2%) as white crystals.

1. stirringthe reaction mixture was stirred for 3 days
2. customThe reaction mixture was partitioned between ethyl acetate and water
3. washThe organic layer was washed with water and brine
4. dry with materialdried over anhydrous sodium sulfate
5. distillationThe solvent was distilled off
6. customthe residue was purified by silica gel column chromatography (eluent; ethyl acetate:methanol=95:5)
7. customThe crystals were precipitated from diethyl ether-hexane (1:2)
8. filtrationfiltered off
9. customdried under aeration