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

HRID 593758Notes

Reaction equation

HRID 593758 reaction equation
[H-].[Na+].[Cl:3][C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1/[C:11](/[C:14]1[C:19](F)=[C:18]([C:21]2[CH:22]=[N:23][CH:24]=[N:25][CH:26]=2)[CH:17]=[CH:16][N:15]=1)=[N:12]/[OH:13]>C1COCC1.CN(C=O)C.C(Cl)Cl>[Cl:3][C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1[C:11]1[C:14]2=[N:15][CH:16]=[CH:17][C:18]([C:21]3[CH:22]=[N:23][CH:24]=[N:25][CH:26]=3)=[C:19]2[O:13][N:12]=1

Participants

6

Reactant 2

HCID 24758Sodium hydrideHCID 136622537(NZ)-N-[(2-chloro-4-fluorophenyl)-(3-fluoro-4-pyrimidin-5-yl-2-pyridinyl)methylidene]hydroxylamine

Product 1

HCID 867304153-(2-Chloro-4-fluorophenyl)-7-(pyrimidin-5-yl)isoxazolo[4,5-b]pyridineYield 33.9%

Reagents, catalysts & solvents 3

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
70 °C

Procedure

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.

Workup

  1. temperatureto cool to room temperature
  2. customThe reaction was quenched with H2O
  3. extractionThe reaction mixture was extracted with EtOAc (3×)
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customfurther dried under high vacuum
  8. customto afford a brown residue
  9. customto be chromatographed
  10. customPurification of the crude material by silica gel chromatography
  11. customan ISCO machine (4 g column, 18 mL/min, 0-80% EtOAc in hexanes over 15 min, tr=3 min)

Sources & evidence

ORD record
ord-7504bc1b0540443c884f358a66012de1
Source dataset
uspto-grants-2016_01
Patent number
US09242967B2

Reaction notes

Loading…