Methyl iodide → 8,9-dihydro-10-ethyl-7-methyl-7[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one

HRID 486228Notes

Reaction equation

HRID 486228 reaction equation
[CH:1](NC(C)C)(C)C.C([Li])CCC.[CH2:13]([C:15]1[C:23]2[C:18](=[CH:19][CH:20]=[CH:21][CH:22]=2)[N:17]2[C:24](=[O:54])[CH:25]([CH2:28][C:29]3[N:30]=[CH:31][N:32]([C:35]([C:48]4[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=4)([C:42]4[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=4)[C:36]4[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=4)[C:33]=3[CH3:34])[CH2:26][CH2:27][C:16]=12)[CH3:14].CI>O1CCCC1.CCCCCC.O>[CH2:13]([C:15]1[C:23]2[C:18](=[CH:19][CH:20]=[CH:21][CH:22]=2)[N:17]2[C:24](=[O:54])[C:25]([CH3:1])([CH2:28][C:29]3[N:30]=[CH:31][N:32]([C:35]([C:48]4[CH:49]=[CH:50][CH:51]=[CH:52][CH:53]=4)([C:36]4[CH:37]=[CH:38][CH:39]=[CH:40][CH:41]=4)[C:42]4[CH:43]=[CH:44][CH:45]=[CH:46][CH:47]=4)[C:33]=3[CH3:34])[CH2:26][CH2:27][C:16]=12)[CH3:14]

Participants

8

Reactant 4

HCID 6328Methyl iodideHCID 7912DiisopropylamineHCID 190973078,9-dihydro-10-ethyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]-indol-6(7H)-oneHCID 178418339Butyllithium

Product 1

HCID 190973038,9-dihydro-10-ethyl-7-methyl-7[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent3×HCID 8058HexaneSolvent

Procedure

To a solution of diisopropylamine (202.4 mg) in tetrahydrofuran (5 ml) at -50° C. under nitrogen atmosphere was added 1.64M-butyllithium in hexane (1.23 ml). After being stirred at -60~-70° C. for 30 minutes, the mixture was treated with a solution of 8,9-dihydro-10-ethyl-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one (549 mg) in tetrahydrofuran (10 ml) over 20 minutes. The mixture was stirred at -60~-70° C. stirred for 60 minutes and a solution of methyl iodide (213 mg) in tetrahydrofuran (1 ml) was added dropwise at -60° C. over 10 minutes. After the mixture was stirred at -65° C. for 30 minutes and at -20° C. for 1 hour, it was diluted with water and extracted twice with ethyl acetate. The organic layer was washed with water and brine, dried over anhydrous magnesium sulfate, and evaporated in vacuo to give 8,9-dihydro-10-ethyl-7-methyl-7[(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one, which was dissolved with 80% aqueous acetic acid (6 ml) and stirred at 60° C. for 2 hours. After evaporation of the solvent, the residue was diluted with water, neutralized with an aqueous sodium bicarbonate solution, and extracted twice with 10%-methanol-chloroform. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and evaporated in vacuo. The residue was purified by silica gel column chromatography (5% methanol-chloroform). The obtained 8,9-dihydro-10-ethyl-7methyl-7-[(5-methyl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one was dissolved in 12N-hydrogenchloride in ethanol (1 ml) and evaporated in vacuo. Tritulation of the residue with ether gave 8,9-dihydro-10-ethyl-7-methyl-7-[(5-methyl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol- 6(7H)-one hydrochloride (202.56 mg).

Workup

  1. stirringThe mixture was stirred at -60~-70° C.
  2. stirringstirred for 60 minutes
  3. stirringAfter the mixture was stirred at -65° C. for 30 minutes and at -20° C. for 1 hour
  4. extractionextracted twice with ethyl acetate
  5. washThe organic layer was washed with water and brine
  6. dry with materialdried over anhydrous magnesium sulfate
  7. customevaporated in vacuo

Sources & evidence

ORD record
ord-83972663d835460f9308543d7f494576
Source dataset
uspto-grants-1994_03
Patent number
US05290785

Reaction notes

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