Hydrochloric Acid → N,N-Diethyl-2-formyl-6-methoxybenzamide

HRID 1968766Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1968766
C([Li])(CC)C.CN(C)CCN(C)C.[CH2:14]([N:16]([CH2:27][CH3:28])[C:17](=[O:26])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=1[O:24][CH3:25])[CH3:15].CN(C)[CH:31]=[O:32].Cl>C1COCC1>[CH2:27]([N:16]([CH2:14][CH3:15])[C:17](=[O:26])[C:18]1[C:19]([O:24][CH3:25])=[CH:20][CH:21]=[CH:22][C:23]=1[CH:31]=[O:32])[CH3:28]

Komponenten

7

Edukt 5

HCID 313Hydrochloric AcidHCID 6228DimethylformamideHCID 8037N,N,N',N'-TetramethylethylenediamineHCID 346975N,N-diethyl-2-methoxybenzamideHCID 178418400CID 53628100

Produkt 1

HCID 12460617N,N-Diethyl-2-formyl-6-methoxybenzamideAusbeute 105,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel2×

Versuchsvorschrift

Sec-butyl lithium (99.6 ml, 1.3 M in cyclohexane, 129.45 mmol, 1.3 equiv) was added dropwise at −78° C. to a solution of N,N,N′,N′-tetramethyl-ethane-1,2-diamine (15.04 g, 129.45 mmol, 1.3 equiv) in anhydrous THF (400 ml) under an atmosphere of argon. After 30 minutes at −78° C., a solution of N,N-diethyl-2-methoxy-benzamide (20.64 g, 99.58 mmol) in THF (100 ml) was added dropwise over 50 minutes. After 2 hours at −78° C., N,N-dimethylformamide (8.74 g, 119.49 mmol, 1.2 equiv) was added dropwise. 30 minutes after complete addition, TLC analysis indicated complete conversion. 6N aqueous HCl (90 ml) was carefully added at 0° C. After phase separation, the aqueous phase was extracted with EtOAc. The combined organic layers were washed with brine (2×100 ml), dried over Na2SO4, filtered and concentrated in vacuo to yield the title compound (24.71 g, quant.) in adequate purity for direct use in the next transformation. 1H NMR (400 MHz, CDCl3): δ=9.99 (s, 1H), 7.52 (dd, J=6.6/1.0 Hz, 1H), 7.46 (t, 7.6 Hz, 1H), 7.15 (dd, J=8.3/1.2 Hz, 1H), 3.86 (s, 3H), 3.78-3.68 (m, 1H), 3.58-3.49 (m, 1H), 3.10 (q, J=7.1 Hz, 2H), 1.29 (t, J=7.1 Hz, 3H), 1.01 (t, J=7.3 Hz, 3H). MS (ES+): 236 (M+H)+.

Aufarbeitung

  1. waitAfter 2 hours at −78° C.
  2. addition30 minutes after complete addition, TLC analysis
  3. customAfter phase separation
  4. extractionthe aqueous phase was extracted with EtOAc
  5. washThe combined organic layers were washed with brine (2×100 ml)
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-f4b9d95fb24d45eda953c972243c0f5c
Quelldatensatz
uspto-grants-2013_04
Patentnummer
US08426440B2

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