Water → HCID 15023211, compound

Participants

Reaction Steps

Then, 60% sodium hydride (0.03 g) was suspended in dimethylformamide (5 ml), and a solution of the abovedescribed 7-(2-chloro-6-fluoro-4-trifluoromethylphenoxy)-2(R)-methyl-2H-1,4-benzoxazine-3 (4H)-one (0.3 g) in dimethylformamide (5 ml) was dropwise added thereto while cooling with water. The mixture was stirred for 10 min, methyl iodide (0.1 g) was added thereto, and the mixture was stirred for an additional 10 min. Water (10 ml) was added thereto to terminate the reaction, and the reaction mixture was extracted with ethyl acetate (20 ml×2), washed with water and a saturated saline solution and dried over anhydrous magnesium sulfate. The solvent was distilled off in vacuo, and the residue was purified by silica gel column chromatography (developing solvent: n-hexane/ethyl acetate=3/1) to prepare the title compound (0.3 g) as a colorless crystal. The compound thus prepared was subjected to HPLC analysis for chiral separation and found to be in agreement with the first eluted fraction in the case of racemate (Example 26) modification and have an optical purity of 80%.

Provenance & Evidence