N-bromobutanimide → HCID 49765956, Verbindung

HRID 406923Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 406923
[CH3:1][O:2][CH:3]([O:24][CH3:25])[CH2:4][N:5]1[CH:10]=[CH:9][C:8](=[O:11])[C:7]([O:12][CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[C:6]1[C:20]([O:22][CH3:23])=[O:21].C1C(=O)N([Br:33])C(=O)C1>ClCCl>[CH3:25][O:24][CH:3]([O:2][CH3:1])[CH2:4][N:5]1[CH:10]=[C:9]([Br:33])[C:8](=[O:11])[C:7]([O:12][CH2:13][C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)=[C:6]1[C:20]([O:22][CH3:23])=[O:21]

Komponenten

4

Edukt 2

HCID 67184N-bromobutanimideHCID 58067201HCID 58067201, Verbindung

Produkt 1

HCID 49765956HCID 49765956, Verbindung

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel2×

Versuchsvorschrift

A 2 L flask equipped with a mechanic stirrer were charged with methyl 1-[2,2-bis(methyloxy)ethyl]-4-oxo-3-[(phenylmethyl)oxy]-1,4-dihydro-2-pyridinecarboxylate 23 as obtained above and 500 mL of dichloromethane. To this flask was added NBS (30 g, 0.17 mole) portion-wise. The reaction was stirred at room temperature until its completion (monitored by TLC, ˜6 hours). The mixture was then diluted with dichloromethane and washed with NaHCO3 (ss). The organic phase was dried over Na2SO4 before evaporation of the solvents. The crude product was purified by column chromatargraphy (silcal gel, EtOH/DCM: 0-40%) to afford methyl 1-[2,2-bis(methyloxy)ethyl]-5-bromo-4-oxo-3-[(phenylmethyl)oxy]-1,4-dihydro-2-pyridinecarboxylate 24 as a light brown solid (50 g, 60% over three steps). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.7 (s, 1H), 7.4 (m, 2H), 7.3 (d, J=7.9 Hz, 3H), 5.3 (s, 2H), 4.4 (s, 1H), 3.8 (d, J=4.8 Hz, 2H), 3.8 (s, 3H), 3.4 (s, 6H). LC-MS (M+H+): calcd 426, obsd 426.

Aufarbeitung

  1. customA 2 L flask equipped with a mechanic stirrer
  2. washwashed with NaHCO3 (ss)
  3. dry with materialThe organic phase was dried over Na2SO4 before evaporation of the solvents
  4. customThe crude product was purified by column chromatargraphy (silcal gel, EtOH/DCM: 0-40%)

Quellen und Nachweise

ORD-Eintrag
ord-3f1274b1c5fa406ba797b8b5ae2d3207
Quelldatensatz
uspto-grants-2014_06
Patentnummer
US08754214B2

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