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Triethylamine → diethyl 3-(p-chlorophenyl)-4-methyl-2-oxo-2H-pyrano[2,3-b]pyridine-6,7-dicarboxylate

HRID 1655869
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1655869
[C:1]([C:4]1[C:9](=O)[NH:8][C:7]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:6]([C:16]([O:18][CH2:19][CH3:20])=[O:17])[CH:5]=1)(=O)[CH3:2].[Cl:21][C:22]1[CH:27]=[CH:26][C:25]([CH2:28][C:29]([OH:31])=[O:30])=[CH:24][CH:23]=1.C(N(CC)CC)C.[OH-].[NH4+]>C(OC(=O)C)(=O)C>[Cl:21][C:22]1[CH:23]=[CH:24][C:25]([C:28]2[C:29](=[O:31])[O:30][C:9]3=[N:8][C:7]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:6]([C:16]([O:18][CH2:19][CH3:20])=[O:17])[CH:5]=[C:4]3[C:1]=2[CH3:2])=[CH:26][CH:27]=1
KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 4

HCID 8471TriethylamineHCID 14923Ammonium HydroxideHCID 15880(4-Chlorophenyl)acetic acidHCID 13752508Diethyl 5-acetyl-1,6-dihydro-6-oxo-2,3-pyridinedicarboxylate

Produkt 1

HCID 19958229diethyl 3-(p-chlorophenyl)-4-methyl-2-oxo-2H-pyrano[2,3-b]pyridine-6,7-dicarboxylateAusbeute 99,4 %

Reagenzien, Katalysatoren, Lösungsmittel

1
HCID 7918Acetic AnhydrideLösungsmittel

Versuchsvorschrift

Diethyl 5-acetyl-1,6-dihydro-6-oxo-2,3-pyridinedicarboxylate, (6.0 g, 0.0213 mol), 4-chlorophenyl acetic acid (3.64 g, 0.0213 mol) and triethylamine (3.0 g, 1.5 eq) are refluxed in 50 mL of acetic anhydride for three and one-half hours and then stirred at room temperature overnight. The reaction mixture is poured into 100 mL of ice cold water and the pH is adjusted to 8 with an ammonium hydroxide solution. The crystalline solid is filtered, washed with water, dried and dissolved in 100 mL of methylene chloride. The solution is dried over anhydrous sodium sulfate and the solvent removed under reduced pressure to give the desired product (8.8 g, 99%), which is crystallized from ethyl acetate to give the pure product having a melting point 179°-181° C.

Aufarbeitung

  1. filtrationThe crystalline solid is filtered
  2. washwashed with water
  3. customdried
  4. dissolutiondissolved in 100 mL of methylene chloride
  5. dry with materialThe solution is dried over anhydrous sodium sulfate
  6. customthe solvent removed under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-ef8c9e54b19b4c989646eef06a4c1a8c
Quelldatensatz
uspto-grants-1993_10
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05252538

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