Ethyl diazoacetate → Ethyl 5-benzyl-4,6-dioxo-1,3a,4,5,6,6a-hexahydropyrrolo[3,4-c]pyrazole-3-carboxylate

HRID 373694

Reaktionsgleichung

Reaktionsgleichung von HRID 373694
[N+:1](=[CH:3][C:4]([O:6][CH2:7][CH3:8])=[O:5])=[N-:2].[CH2:9]([N:16]1[C:20](=[O:21])[CH:19]=[CH:18][C:17]1=[O:22])[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1>C(OCC)C>[CH2:9]([N:16]1[C:20](=[O:21])[CH:19]2[CH:18]([NH:2][N:1]=[C:3]2[C:4]([O:6][CH2:7][CH3:8])=[O:5])[C:17]1=[O:22])[C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=1

Komponenten

4

Edukt 2

HCID 12192Ethyl diazoacetateHCID 74204Benzylmaleimide

Produkt 1

HCID 2857138Ethyl 5-benzyl-4,6-dioxo-1,3a,4,5,6,6a-hexahydropyrrolo[3,4-c]pyrazole-3-carboxylateAusbeute 100 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 3283Diethyl EtherLösungsmittel2×

Versuchsvorschrift

Ethyl diazoacetate (13 g, 114 mmol) in diethyl ether (100 ml) was added dropwise to a solution of N-benzylmaleimide (10 g, 53 mmol) in diethyl ether (250 ml). The resulting mixture was allowed to stir for 18 hours; the solvent was then removed in vacuo, and the resulting residue partitioned between methylene chloride and water. The organic layer was dried over sodium sulfate, filtered and concentrated to provide the title product as a white solid, mp 145°-146° with decomposition (16 g, 53 mmol, 100% yield). 1H NMR (CDCl3): 7.31 (m, 5H), 7.02 (bs, 1H), 4.89 (dd, J=11, 2 Hz, 1H), 4.65 (s, 2H), 4.55 (d, J=10 Hz, 1H), 4.36 (q, J=7 Hz, 2H), 1.37 (t, J=7 Hz, 3H).

Aufarbeitung

  1. customthe solvent was then removed in vacuo
  2. customthe resulting residue partitioned between methylene chloride and water
  3. dry with materialThe organic layer was dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-1bf83f3744b64d53af9c0e93171c4542
Quelldatensatz
uspto-grants-1992_11
Patentnummer
US05164402

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