Methanol → Methyl 3-[(2,6-dichlorophenyl)methyl]-5-(1-methylethyl)-4-isoxazolecarboxylate

HRID 646012Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 646012
[C:1]([CH2:6][C:7]([O:9][CH3:10])=[O:8])(=[O:5])[CH:2]([CH3:4])[CH3:3].C[O-].[Na+].CO.[Cl:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[C:18]=1[CH2:24][C:25](Cl)=[N:26]O>O1CCCC1>[Cl:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[C:18]=1[CH2:24][C:25]1[C:6]([C:7]([O:9][CH3:10])=[O:8])=[C:1]([CH:2]([CH3:4])[CH3:3])[O:5][N:26]=1

Komponenten

6

Edukt 4

HCID 887MethanolHCID 2759969Methyl 4-methyl-3-oxopentanoateHCID 10942334Sodium MethoxideHCID 722650192-(2,6-dichlorophenyl)-N-hydroxyethanimidoyl chloride

Produkt 1

HCID 59264879Methyl 3-[(2,6-dichlorophenyl)methyl]-5-(1-methylethyl)-4-isoxazolecarboxylateAusbeute 30 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel2×

Versuchsvorschrift

A solution of methyl isobutyrylacetate (1.93 g, 13.4 mmol) in tetrahydrofuran (2.7 mL) was stirred at 0° C. as 0.5 N sodium methoxide in methanol solution (27 mL, 13.5 mmol) was added. A solution of 2-(2,6-dichlorophenyl)-N-hydroxyethanimidoyl chloride (2.60 g, 11.18 mmol) in tetrahydrofuran (8.7 mL) was added and the solution was allowed to warm to room temperature and stir overnight. The mixture was concentrated then partitioned between water and ethyl acetate. The organic layer was dried with magnesium sulfate, filtered, and concentrated. The residue was purified by chromatography (silica gel, 0%-30% ethyl acetate in hexane) to provide the title compound (1.10 g, 30%). 1HNMR (DMSO-d6): δ 7.48 (d, J=8 Hz, 2H), 7.34 (t, J=8 Hz, 1H), 4.42 (s, 2H), 3.84 (s, 3H), 3.68 (septet, J=7 Hz, 1H), 1.24 (d, J=7 Hz, 6H).

Aufarbeitung

  1. additionwas added
  2. concentrationThe mixture was concentrated
  3. customthen partitioned between water and ethyl acetate
  4. dry with materialThe organic layer was dried with magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was purified by chromatography (silica gel, 0%-30% ethyl acetate in hexane)

Quellen und Nachweise

ORD-Eintrag
ord-d544b8d5e2304332b584c2f218a9b5c8
Quelldatensatz
uspto-grants-2010_04
Patentnummer
US07705028B2

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