N-Hydroxy-3,4,5-trimethoxybenzamide → 4,4-Diethyl-2-(3,4,5-trimethoxybenzoyl)-3,5-isoxazolidinedione

HRID 1709035

Reaktionsgleichung

Reaktionsgleichung von HRID 1709035
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:10]=[C:11]([O:15][CH3:16])[C:12]=1[O:13][CH3:14])[C:6]([NH:8][OH:9])=[O:7].[CH2:17]([C:19]([CH2:26][CH3:27])([C:23](Cl)=[O:24])[C:20](Cl)=[O:21])[CH3:18]>>[CH3:16][O:15][C:11]1[CH:10]=[C:5]([CH:4]=[C:3]([O:2][CH3:1])[C:12]=1[O:13][CH3:14])[C:6]([N:8]1[C:20](=[O:21])[C:19]([CH2:26][CH3:27])([CH2:17][CH3:18])[C:23](=[O:24])[O:9]1)=[O:7]

Komponenten

3

Edukt 2

HCID 237472N-Hydroxy-3,4,5-trimethoxybenzamideHCID 4149059Diethylmalonyl dichloride

Produkt 1

HCID 1302484,4-Diethyl-2-(3,4,5-trimethoxybenzoyl)-3,5-isoxazolidinedioneAusbeute 81,5 %

Versuchsvorschrift

A mixture consisting of 2.27 g (0.0100 mol) of 3,4,5-trimethoxybenzohydroxamic acid (recrystalized from absolute ethanol prior to the reaction), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round-bottom flask. The mixture was cooled in an ice bath, and 2.00 g (0.0101 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period. The reaction mixture was stirred for one hour at room temperature after which time all of the hydroxamic acid had dissolved. The solution was extracted three times with 50 ml portions of water, four times 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride solution was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.86 g (81.5%) of crude 2-(3,4,5-trimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue: mp 103°-106° C. Recrystallization of 2.72 g of the crude product from 20 ml of absolute ethanol gave 2.14 g of 2-(3,4,5-trimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione: mp 107°-109.5° C.

Aufarbeitung

  1. customrecrystalized from absolute ethanol
  2. customto the reaction), 5 ml of pyridine, and 100 ml of methylene chloride
  3. customwas prepared in a 250 ml round-bottom flask
  4. temperatureThe mixture was cooled in an ice bath
  5. dissolutionhad dissolved
  6. extractionThe solution was extracted three times with 50 ml portions of water, four times 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate
  7. dry with materialThe methylene chloride solution was dried (MgSO4)
  8. customevaporated to dryness under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-ba21a5e87ef544b1b29b296638d32358
Quelldatensatz
uspto-grants-1990_08
Patentnummer
US04946963

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