Hydrochloric Acid → Methyl 4-cyano-2-cyclopropyl-7-fluoro-5-methyl-1,3-benzoxazole-6-carboxylate

HRID 17464

Reaktionsgleichung

Reaktionsgleichung von HRID 17464
[CH:1]1([C:4]2[O:5][C:6]3[C:7](=[C:9]([C:17]#[N:18])[C:10]([CH3:16])=[C:11]([CH:14]=[O:15])[C:12]=3[F:13])[N:8]=2)[CH2:3][CH2:2]1.O.O.P([O-])(O)(O)=O.[Na+].CC(=CC)C.Cl([O-])=O.[Na+].Cl.C[Si](C=[N+]=[N-])(C)C.[CH2:44]([O:46]CC)C.C(=O)([O-])O.[Na+]>C(O)(C)(C)C.C(OCC)(=O)C.O.O1CCCC1>[C:17]([C:9]1[C:7]2[N:8]=[C:4]([CH:1]3[CH2:2][CH2:3]3)[O:5][C:6]=2[C:12]([F:13])=[C:11]([C:14]([O:46][CH3:44])=[O:15])[C:10]=1[CH3:16])#[N:18]

Komponenten

12

Edukt 7

HCID 313Hydrochloric AcidHCID 105532-Methyl-2-buteneHCID 516892Sodium BicarbonateHCID 23159941trimethylsilyldiazomethane Et2OHCID 23668197Sodium ChloriteHCID 23673460Sodium Phosphate, Monobasic, DihydrateHCID 860975112-Cyclopropyl-7-fluoro-6-formyl-5-methyl-1,3-benzoxazole-4-carbonitrile

Produkt 1

HCID 68584578Methyl 4-cyano-2-cyclopropyl-7-fluoro-5-methyl-1,3-benzoxazole-6-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 4

HCID 962WaterLösungsmittelHCID 6386tert-ButanolLösungsmittelHCID 8028TetrahydrofuranLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

2-Cyclopropyl-7-fluoro-6-formyl-5-methyl-1,3-benzoxazole-4-carbonitrile (I-182) (280 mg, 1.15 mmol) was dissolved in tert-butanol (8 ml), tetrahydrofuran (6 ml) and water (6 ml), then at 0° C., sodium dihydrogenphosphate dihydrate (268 mg, 1.72 mmol), 2-methyl-2-butene (515 μl, 4.59 mmol), then sodium chlorite (purity 80%, 389 mg, 3.44 mmol) were added. After stirring at room temperature for 6 hours, the solvent was evaporated away under reduced pressure. The residue was fractionated with ethyl acetate and aqueous 1 mol hydrochloric acid solution. The aqueous layer was further extracted twice with ethyl acetate. The organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate. The insoluble matter was separated by filtration, then the solvent was evaporated away under reduced pressure. Benzene (6 ml) and methanol (2 ml) were added to it, then at 0° C., 2 M trimethylsilyldiazomethane/diethyl ether solution (1.15 ml, 2.29 mmol) was added. After stirring at room temperature for 18 hours, an aqueous saturated sodium hydrogencarbonate solution was added at 0° C. The solution was extracted three times with ethyl acetate. The organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate.

Aufarbeitung

  1. customthe solvent was evaporated away under reduced pressure
  2. extractionThe aqueous layer was further extracted twice with ethyl acetate
  3. washwashed with saturated brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. customThe insoluble matter was separated by filtration
  6. customthe solvent was evaporated away under reduced pressure
  7. additionBenzene (6 ml) and methanol (2 ml) were added to it
  8. stirringAfter stirring at room temperature for 18 hours
  9. extractionThe solution was extracted three times with ethyl acetate
  10. washwashed with saturated brine
  11. dry with materialdried over anhydrous sodium sulfate

Quellen und Nachweise

ORD-Eintrag
ord-fa7d282936834f32bfd058f39b21932c
Quelldatensatz
uspto-grants-2010_06
Patentnummer
US07737166B2

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