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Hydrochloric Acid → HCID 11845250, Verbindung

HRID 2216594
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 2216594
[Li+].[BH4-].[N+:3]([C:6]1[CH:29]=[CH:28][C:9]([CH2:10][O:11][C:12]([N:14]2[CH2:19][CH2:18][N:17]3[N:20]=[C:21]([C:23](OCC)=[O:24])[CH:22]=[C:16]3[CH2:15]2)=[O:13])=[CH:8][CH:7]=1)([O-:5])=[O:4].Cl.C([O-])([O-])=O.[K+].[K+]>CO.C1COCC1>[N+:3]([C:6]1[CH:29]=[CH:28][C:9]([CH2:10][O:11][C:12]([N:14]2[CH2:19][CH2:18][N:17]3[N:20]=[C:21]([CH2:23][OH:24])[CH:22]=[C:16]3[CH2:15]2)=[O:13])=[CH:8][CH:7]=1)([O-:5])=[O:4]
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

7

Edukt 4

HCID 313Hydrochloric AcidHCID 11430Potassium CarbonateHCID 4148881Lithium borohydride2×HCID 11845245HCID 11845245, Verbindung

Produkt 1

HCID 11845250HCID 11845250, VerbindungAusbeute 95,1 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 887
Methanol
Lösungsmittel
2×
HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
40 °C

Versuchsvorschrift

LiBH4 (640 mg) and MeOH (1.2 mL) was added to the THF (267 mL) solution of 6,7-dihydro-4H-pyrazolo[1,5-a]pyrazine-2,5-dicarboxylic acid 2-ethyl ester 5-(4-nitrobenzyl) ester (10 g) under a nitrogen atmosphere at room temperature and stirred for 3 h at 40° C. Additional LiBH4 (523 mg) and MeOH (1.0 mL) was added to the solution and stirred for 1 h at 40° C. and 1 h at 50° C. The mixture was acidified with 3 mol/L HCl to pH 2 and stirred for 1 h at room temperature, then solid K2CO3 was added to the solution to adjust pH to 8. The insoluble material was filtered off and the filtrate was extracted with AcOEt. The organic layer was dried (K2CO3), and concentrated under reduced pressure. The residue was purified with silica gel column chromatography (CHCl3/MeOH=49/1–19/1) to afford titled compound as pale yellow crystals (8.44 g, 95%).

Aufarbeitung

  1. stirringstirred for 1 h at 40° C. and 1 h at 50° C
  2. stirringstirred for 1 h at room temperature
  3. filtrationThe insoluble material was filtered off
  4. extractionthe filtrate was extracted with AcOEt
  5. dry with materialThe organic layer was dried (K2CO3)
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified with silica gel column chromatography (CHCl3/MeOH=49/1–19/1)

Quellen und Nachweise

ORD-Eintrag
ord-8648e07cd10e45568345bef2d6b2f768
Quelldatensatz
uspto-grants-2006_09
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US07112582B2

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