Potassium Carbonate → N-[3-[4-[bis(4-methylphenyl)methoxy]piperidino]propyl]phthalimide

HRID 1067591Notes

Reaction equation

HRID 1067591 reaction equation
[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]([C:16]2[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][CH:17]=2)ON2CCCCC2)=[CH:4][CH:3]=1.Br[CH2:24][CH2:25][CH2:26][N:27]1[C:31](=[O:32])[C:30]2=[CH:33][CH:34]=[CH:35][CH:36]=[C:29]2[C:28]1=[O:37].[C:38](=[O:41])([O-])[O-].[K+].[K+]>CN(C)C=O>[CH3:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([C:16]2[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][CH:17]=2)[O:41][CH:38]2[CH2:29][CH2:28][N:27]([CH2:24][CH2:25][CH2:26][N:27]3[C:31](=[O:32])[C:30]4=[CH:33][CH:34]=[CH:35][CH:36]=[C:29]4[C:28]3=[O:37])[CH2:26][CH2:25]2)=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 21611N-3-BromopropylphthalimideHCID 17815938Bis(4-methylphenyl)methoxylpiperidine

Product 1

HCID 22989310N-[3-[4-[bis(4-methylphenyl)methoxy]piperidino]propyl]phthalimide

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

25 g of 4,4′-dimethylbenzophenone was dissolved in ethanol-tetrahydrofuran (180 ml-60 ml); 2.23 g of sodium borohydride was added under ice cooling conditions, followed by stirring at room temperature for 24 hours. The mixture was concentrated under reduced pressure; ice water was added to the residue; the crystal precipitated was collected and dried; the crystal obtained (30.5 g) was dissolved in 800 ml of toluene; 11.9 g of 4-hydroxypiperidine and 24.9 g of p-toluenesulfonic acid monohydrate were added, followed by thermal refluxing for 3 hours. After cooling, the mixture was concentrated under reduced pressure; 100 ml of ice water and 140 ml of a 1 N aqueous solution of sodium hydroxide were added, followed by extraction with ethyl acetate; the extract was washed with saline and dried with sodium sulfate. The dry product was concentrated under reduced pressure; the residue was subjected to silica gel column chromatography and eluted with ethyl acetate-methanol-triethylamine (90;10:1). The desired fraction was collected to yield 32.8 g of 4-[bis(4-methylphenyl)methoxy]piperidine as an oily substance. 16.4 g of 4-[bis(4-methylphenyl)methoxylpiperidine was dissolved in 100 ml of N,N-dimethylformamide; 14.2 g of N-(3-bromopropyl)phthalimide and 8.15 g of potassium carbonate were added, followed by stirring at room temperature for 16 hours. Ice water was added to the reaction mixture, followed by extraction with ethyl acetate; the extract was washed with saline and dried with magnesium sulfate. The dry product was concentrated under reduced pressure; the residue was subjected to silica gel column chromatography and eluted with hexane-ethyl acetate (1:2). The desired fraction was collected to yield 21.2 g of N-[3-[4-[bis(4-methylphenyl)methoxy]piperidino]propyl]phthalimide as an oily substance. 20.5 g of this oily substance was dissolved in 150 ml of ethanol; 2.18 ml of hydrazine monohydrate was added, followed by thermal refluxing for 3 hours. After cooling, the mixture was concentrated under reduced pressure; ethanol was added to the residue; the crystal precipitated was collected, dissolved in 40 ml of a 1 N aqueous solution of sodium hydroxide and extracted with ethyl acetate-tetrahydrofuran (2:1); the extract was washed with saline and dried with sodium sulfate. The dry product was concentrated under reduced pressure to yield 10.5 g of the title compound as an oily substance.

Workup

  1. extractionfollowed by extraction with ethyl acetate
  2. washthe extract was washed with saline
  3. dry with materialdried with magnesium sulfate
  4. concentrationThe dry product was concentrated under reduced pressure
  5. washeluted with hexane-ethyl acetate (1:2)
  6. customThe desired fraction was collected

Sources & evidence

ORD record
ord-e12fd7bd08374dd19a5c921774a104f7
Source dataset
uspto-grants-2001_06
Patent number
US06248740B1

Reaction notes

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