Water → (+/-)-1-Methyl-3-(6-methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-piperidin-2-one

HRID 858898

Reaktionsgleichung

Reaktionsgleichung von HRID 858898
CO[C:3](=[O:26])[CH:4]([C:9]1[N:13]2[CH:14]=[C:15]([CH3:18])[CH:16]=[CH:17][C:12]2=[N:11][C:10]=1[C:19]1[CH:24]=[CH:23][C:22]([CH3:25])=[CH:21][CH:20]=1)[CH2:5][CH2:6][CH:7]=O.[CH3:27][NH2:28].[BH4-].[Na+].O>CO.CO.CCOC(C)=O>[CH3:27][N:28]1[CH2:7][CH2:6][CH2:5][CH:4]([C:9]2[N:13]3[CH:14]=[C:15]([CH3:18])[CH:16]=[CH:17][C:12]3=[N:11][C:10]=2[C:19]2[CH:24]=[CH:23][C:22]([CH3:25])=[CH:21][CH:20]=2)[C:3]1=[O:26]

Komponenten

7

Edukt 4

HCID 962WaterHCID 6329MethylamineHCID 4311764Sodium borohydrideHCID 587635832-(6-Methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-5-oxo-pentanoic acid methyl ester

Produkt 1

HCID 11325081(+/-)-1-Methyl-3-(6-methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-piperidin-2-oneAusbeute 35,6 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 887MethanolLösungsmittelHCID 21584119Ethylacetate methanolLösungsmittel

Versuchsvorschrift

To a magnetically stirred solution of (±)-2-(6-methyl-2-p-tolyl-imidazo[1,2-a]pyridin-3-yl)-5-oxo-pentanoic acid methyl ester 35c (0.085 g, 0.253 mmol) in methanol (1 mL) at room temperature under Ar atmosphere was added a 40% aqueous solution of methyl amine (MeNH2) (0.021 mL, 0.253 mmol). The reaction mixture was stirred for 1 h at room temperature. NaBH4 (0.019 g, 0.506 mmol) was added at room temperature. After 30 min, water (30 mL) was added, and the aqueous phase was extracted with EtOAc (2×50 mL). The combined organic layers were dried (MgSO4), and concentrated in vacuo to the crude product. The pure product was obtained by column chromatography over silica gel (EtOAc, then 4:96 MeOH/EtOAc as eluent) which gave the title compound (0.03 g, 31%) as a white solid. The combined organic layers were washed with water, dried (MgSO4), and concentrated in vacuo to the crude product. 1H NMR (400 MHz, CDCl3) δ 1.99 (m, 3H), 2.11 (m, 1H), 2.31 (s, 3H), 2.38 (s, 3H), 3.05 (s, 3H), 3.41 (m, 1H), 3.53 (m, 1H), 4.25 (m, 1H), 6.99 (d, J=9.1 Hz, 1H), 7.22 (m, 3H), 7.46 (s, 1H), 7.53 (m, 2H). 13C NMR (100 MHz, CDCl3) δ 18.9, 21.5, 23.1, 26.1, 35.4, 39.7, 50.3, 117.4, 119.1, 121.5, 121.7, 127.0, 129.1, 129.3, 132.4, 137.5, 143.9, 144.4, 168.7. Mass spectrum m/e 335 (M+).

Aufarbeitung

  1. waitAfter 30 min
  2. extractionthe aqueous phase was extracted with EtOAc (2×50 mL)
  3. dry with materialThe combined organic layers were dried (MgSO4)
  4. concentrationconcentrated in vacuo to the crude product
  5. customThe pure product was obtained by column chromatography over silica gel (EtOAc

Quellen und Nachweise

ORD-Eintrag
ord-7a0e285c2ce54395bd4b2c4fd3f69c6c
Quelldatensatz
uspto-grants-2006_12
Patentnummer
US07148353B2

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