Sodium Bicarbonate → HCID 21928208, compound

HRID 749204Notes

Reaction equation

HRID 749204 reaction equation
C([NH:4][C:5]1[CH:31]=[CH:30][C:8]2[C:9]([CH2:12][CH2:13][C:14]3[N:15]=[C:16]([C:22]4[CH:27]=[CH:26][C:25]([Cl:28])=[CH:24][C:23]=4[Cl:29])[O:17][C:18]=3[CH:19]([CH3:21])[CH3:20])=[N:10][O:11][C:7]=2[CH:6]=1)(=O)C.C(=O)([O-])O.[Na+]>Cl>[NH2:4][C:5]1[CH:31]=[CH:30][C:8]2[C:9]([CH2:12][CH2:13][C:14]3[N:15]=[C:16]([C:22]4[CH:27]=[CH:26][C:25]([Cl:28])=[CH:24][C:23]=4[Cl:29])[O:17][C:18]=3[CH:19]([CH3:21])[CH3:20])=[N:10][O:11][C:7]=2[CH:6]=1

Participants

4

Reactant 2

HCID 516892Sodium BicarbonateHCID 21928206HCID 21928206, compound

Product 1

HCID 21928208HCID 21928208, compoundYield 94.4%

Reagents, catalysts & solvents 1

HCID 313Hydrochloric AcidSolvent

Procedure

The obtained 6-acetamido-3-[2-[2-(2,4-dichlorophenyl)-5-isopropyl-4-oxazolyl]ethyl]-1,2-benzisoxazole (900 mg, 1.96 mmol) was reacted in 3N hydrochloric acid (45 mL) at 100° C. for 4 hours. The reaction mixture was allowed to room temperature, neutralized with a saturated aqueous sodium hydrogen carbonate solution, and extracted with ethyl acetate. The organic layer was washed with saline, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure to give 6-amino-3-[2-[2-(2,4-dichlorophenyl)-5-isopropyl-4-oxazolyl]ethyl]-1,2-benzisoxazole (770 mg) as brown oil in the residue. The product (770 mg, 1.85 mmol) was'suspended in 25% sulfuric acid (9.3 mL), and cooled with ice. An aqueous sodium nitrite solution (166 mg, 2.41 mmol/1.3 ml) was dropwise added to the suspension for 5 minutes. The resulting solution was stirred for 45 minutes under the same conditions. The reaction mixture was dropwise added to a 75% sulfuric acid (7.4 mL) while refluxing for 5 minutes, and the mixture was refluxed for 4 hours. The reaction mixture was left to get cool, extracted with diethyl ether, washed with a saturated aqueous ammonium chloride solution and saline, and dried over anhydrous sodium sulfate. Diethyl ether was removed under reduced pressure. The residue was purified by column chromatography on silica gel with hexane/ethyl acetate (3/1) to give the desired compound (138 mg) as pale yellow oil (yield of the two steps 17%).

Workup

  1. customwas allowed to room temperature
  2. extractionextracted with ethyl acetate
  3. washThe organic layer was washed with saline
  4. dry with materialdried over anhydrous sodium sulfate
  5. customThe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-0a4da740709a47efbe874f8bbe7b8efd
Source dataset
uspto-grants-2008_07
Patent number
US07402597B2

Reaction notes

Loading…