N,N-dimethylhydroxylamine hydrochloride → 1-Ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid methyl amide

HRID 646247

Reaktionsgleichung

Reaktionsgleichung von HRID 646247
[CH2:1]([N:3]1[CH:7]=[C:6]([C:8]#[C:9][C:10]2[CH:15]=[CH:14][CH:13]=[C:12]([O:16][CH3:17])[CH:11]=2)[CH:5]=[C:4]1[C:18](Cl)=[O:19])[CH3:2].Cl.[CH3:22][N:23](C)O.C(N(C(C)C)CC)(C)C>C(Cl)Cl>[CH3:22][NH:23][C:18]([C:4]1[N:3]([CH2:1][CH3:2])[CH:7]=[C:6]([C:8]#[C:9][C:10]2[CH:15]=[CH:14][CH:13]=[C:12]([O:16][CH3:17])[CH:11]=2)[CH:5]=1)=[O:19]

Komponenten

5

Edukt 3

HCID 27969N,N-dimethylhydroxylamine hydrochlorideHCID 81531DiisopropylethylamineHCID 875425851-Ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid chloride

Produkt 1

HCID 686995231-Ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid methyl amideAusbeute 93,6 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel2×

Versuchsvorschrift

This intermediate (2.5 g, 9.28 mmol) was treated with oxalyl chloride (4.1 mL, 46.4 mmol), DMF (2 drops) in methylene chloride (70 mL) and stirred at room temperature for 2 hours to give 1-ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid chloride (2.7 g, 9.38 mmol) after a usual workup. 1-Ethyl-4-(3-methoxy-phenylethynyl)-1H-pyrrole-2-carboxylic acid chloride (2.7 g, 9.38 mmol) was diluted with methylene chloride (35 mL) and added to a prepared solution of N,O, dimethyl-hydroxylamine hydrochloride (4.6 g, 46.4 mmol) and diisopropyl-ethyl amine (13 mL, 74.3 mmol) in methylene chloride (35 mL) over 5 minutes. The reaction was complete after 4 hours. Solvent was removed in vacuo and the residue was taken back in a mixture of saturated aqueous NH4Cl:H2O (1:1, 150 mL) solution and extracted with ether. Combined ether extracts were washed with brine dried (MgSO4) and filtered. Evaporation and purification by flash chromatography (hexane/ethyl acetate 9/1) gave the title compound as a light yellow oil (2.48 g g, 82% yield), 1H NMR (400 MHZ, CDCl3) □ 1.35-1.37 (t, 3H), 3.31 (s, 3H), 3.67 (s, 3H), 3.78 (s, 3H), 4.29-4.30 (q, 2H), 6.83 (m, 1H), 6.99 (m, 2H), 7.01 (m, 2H), 7.19 (m, 1H), MS m/e (M+H)+ 313.1.

Aufarbeitung

  1. customSolvent was removed in vacuo
  2. additionthe residue was taken back in a mixture of saturated aqueous NH4Cl:H2O (1:1, 150 mL) solution
  3. extractionextracted with ether
  4. washCombined ether extracts were washed with brine
  5. dry with materialdried (MgSO4)
  6. filtrationfiltered
  7. customEvaporation and purification by flash chromatography (hexane/ethyl acetate 9/1)

Quellen und Nachweise

ORD-Eintrag
ord-8fa842c1a67540568191e7f72bcf607a
Quelldatensatz
uspto-grants-2010_04
Patentnummer
US07705030B2

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