Ammonium Chloride → 1-hexyl-3-formyl-4-methoxy-6-methyl-2(1H)-quinolinone
Reaction equation
[CH2:1]([N:7]1[C:16]2[C:11](=[CH:12][C:13]([CH3:17])=[CH:14][CH:15]=2)[C:10]([O:18][CH3:19])=[C:9]([C:20](OCC)=[O:21])[C:8]1=[O:25])[CH2:2][CH2:3][CH2:4][CH2:5][CH3:6].[H-].C([Al+]CC(C)C)C(C)C.[Cl-].[NH4+]>C1(C)C=CC=CC=1>[CH2:1]([N:7]1[C:16]2[C:11](=[CH:12][C:13]([CH3:17])=[CH:14][CH:15]=2)[C:10]([O:18][CH3:19])=[C:9]([CH:20]=[O:21])[C:8]1=[O:25])[CH2:2][CH2:3][CH2:4][CH2:5][CH3:6]Participants
Conditions
- Temperature
- -78 °C
Procedure
Then a solution of the 1-hexyl-3-ethoxycarbonyl-4-hydroxy-6-methyl-2(1H)-quinolinone (12.4 g) in dichloromethane (50 ml ) and methanol (10 ml) was treated with excess diazomethane in ether for 10 mins. This solution was then evaporated. The crude methylation product upon chromatography on silica gel yielded 1-hexyl-3-ethoxycarbonyl-4-methoxy-6-methyl-2(1H)-quinolinone (11.5 g). The 1-hexyl-3-ethoxycarbonyl-4-methoxy-6-methyl-2(1H)-quinolinone (7.13 g) in dry toluene (80 ml) was cooled to -78° C. and then a 1M solution of di-isobutyl aluminum hydride (30 ml) was added dropwise in 10 min. After 2.5 hours of stirring at -78° C. the reaction mixture was worked up by stirring with aqueous ammonium chloride/1N hydrochloric acid which was then followed by extraction with methylene chloride. The crude reduction product was chromatographed on silica gel and then crystallized from ethyl acetate/hexane to give 1-hexyl- 3-formyl-4-methoxy-6-methyl-2(1H)-quinolinone. That the expected product was obtained was confirmed by the spectral data: MS(CI): m/e 302 (M+): NMR (CDCl3): δ2.42 (s, 3H, Ar-CH3), 4.10 (s, 3H, OCH3), 10.50 (s, 1H, CHO).
Workup
- extractionwas then followed by extraction with methylene chloride
- customThe crude reduction product was chromatographed on silica gel
- customcrystallized from ethyl acetate/hexane
Sources & evidence
- ORD record
- ord-3d75ea64f67643c58313e775bfc18334
- Source dataset
- uspto-grants-1995_05
- Patent number
- US05412104
Reaction notes
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