反应详情

To a methanol (20.0 mL) solution of 2-(2-fluoro-4-(2-nitro-ethyl)-phenoxy)pyridine (500 mg, 1.81 mmol) described in Manufacturing Example 87-1-3 was added lithium methoxide (137 mg, 3.61 mmol) under nitrogen atmosphere at room temperature, which was stirred for 30 minutes at room temperature. The solvent was evaporated from the reaction mixture under a reduced pressure, and anhydrous dichloromethane (15.0 mL) and anhydrous tetrahydrofuran (7.00 mL) were added to the residue. Titanium (IV) chloride (656 μL, 5.97 mmol) was added dropwise into the reaction mixture on a dry ice-ethanol bath (−78° C.), which was stirred for 30 minutes at that temperature. Sodium hydrogencarbonate and ethyl acetate were added to the reaction mixture on an ice cooling (0° C.), which was then filtered through a Celite pad. The organic layer of the filtrate was extracted with ethyl acetate, and that organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure to obtain a crude product (300 mg). To a tetrahydrofuran (5.00 mL) solution of this crude product (150 mg) and 3-ethynyl-pyridin-2-ylamine (30.0 mg, 0.254 mmol) described in Manufacturing Example 1-2-3 was added triethylamine (106 μL, 0.762 mmol) at room temperature, which was stirred for 30 minutes at 50° C. Water was added to the reaction solution at room temperature, which was then extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride and dried over anhydrous magnesium sulfate, and the solvent was evaporated under a reduced pressure. The residue was purified by NH silica gel column chromatography (ethyl acetate:heptane=1:1), the mixture was further purified by reverse-phase high-performance liquid chromatography (using an acetonitrile-water mobile phase containing 0.1% trifluoracetic acid) to obtain the title compound (6.9 mg, 4.49%) as a ditrifluoracetic acid salt.

1. customThe solvent was evaporated from the reaction mixture under a reduced pressure, and anhydrous dichloromethane (15.0 mL) and anhydrous tetrahydrofuran (7.00 mL)
2. additionwere added to the residue
3. stirringwas stirred for 30 minutes at that temperature
4. filtrationwas then filtered through a Celite pad
5. extractionThe organic layer of the filtrate was extracted with ethyl acetate
6. washthat organic layer was washed with water and saturated aqueous sodium chloride
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. concentrationThe filtrate was concentrated under a reduced pressure
10. customto obtain a crude product (300 mg)
11. stirringwhich was stirred for 30 minutes at 50° C
12. extractionwhich was then extracted with ethyl acetate
13. washThe organic layer was washed with saturated aqueous sodium chloride
14. dry with materialdried over anhydrous magnesium sulfate
15. customthe solvent was evaporated under a reduced pressure
16. customThe residue was purified by NH silica gel column chromatography (ethyl acetate:heptane=1:1)
17. customthe mixture was further purified by reverse-phase high-performance liquid chromatography (
18. additioncontaining 0.1% trifluoracetic acid)