Sodium hydride → 3-(2-Chloro-4-fluorophenyl)-7-(pyrimidin-5-yl)isoxazolo[4,5-b]pyridine

Participants

Reaction Conditions

Reaction Steps

To a suspension of sodium hydride (5.69 mg, 0.142 mmol) in THF (Ratio: 1.8, Volume: 1.075 ml) was added dropwise (Z)-(2-chloro-4-fluorophenyl)(3-fluoro-4-(pyrimidin-5-yl)pyridin-2-yl)methanone oxime (0.029 g, 0.084 mmol) in DMF (Ratio: 1.0, Volume: 0.597 ml) slowly. The reaction mixture was heated at 70° C. for 3 hr, and then allowed to cool to room temperature. The reaction was quenched with H2O. The reaction mixture was extracted with EtOAc (3×). The organic phases were combined, dried over Na2SO4, filtered, concentrated, and further dried under high vacuum to afford a brown residue. The crude material was dissolved in a minimal amount of CH2Cl2 to be chromatographed. Purification of the crude material by silica gel chromatography using an ISCO machine (4 g column, 18 mL/min, 0-80% EtOAc in hexanes over 15 min, tr=3 min) gave the title compound (10.3 mg, 0.028 mmol, 33.9% yield) as a yellow solid. ESI MS (M+H)+=327.0.

Provenance & Evidence