反应详情

To a methanol (20 mL) solution of 2-(3-fluoro-phenoxy)-5-(2-nitro-ethyl)-pyridine (1.96 g, 7.47 mmol) described in Manufacturing Example 71-1-3 was added lithium methoxide (567 mg, 14.9 mmol), which was stirred for 35 minutes at room temperature. The reaction mixture was concentrated under a reduced pressure. Titanium (IV) tetrachloride (1.81 mL, 16.4 mmol) was added under nitrogen atmosphere to a tetrahydrofuran (20 mL) and methylene chloride (20 mL) suspension of the residue, and stirred for 1 hour 15 minutes at 0° C. Water was added to the reaction mixture at 0° C., which was then extracted with ethyl acetate. The organic layer was separated, washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure to obtain the title compound (2.1 g, quant.). This compound was used in the subsequent reaction without further purification.

1. concentrationThe reaction mixture was concentrated under a reduced pressure
2. stirringstirred for 1 hour 15 minutes at 0° C
3. extractionwhich was then extracted with ethyl acetate
4. customThe organic layer was separated
5. washwashed with saturated aqueous sodium chloride
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under a reduced pressure