Sodium bis(trimethylsilyl)amide → N-cyclohexyl-N-methyl-4-(1H-imidazo[4,5-c]pyridinylmethyl)benzamide

HRID 1197659Notes

Reaction equation

HRID 1197659 reaction equation
C[Si]([N-][Si](C)(C)C)(C)C.[Na+].[NH:11]1[C:19]2[CH:18]=[CH:17][N:16]=[CH:15][C:14]=2[N:13]=[CH:12]1.[CH:20]1([N:26]([CH3:37])[C:27](=[O:36])[C:28]2[CH:33]=[CH:32][C:31]([CH2:34]Br)=[CH:30][CH:29]=2)[CH2:25][CH2:24][CH2:23][CH2:22][CH2:21]1>C1COCC1.C(OCC)(=O)C.CO.O>[CH:20]1([N:26]([CH3:37])[C:27](=[O:36])[C:28]2[CH:33]=[CH:32][C:31]([CH2:34][N:11]3[C:19]4[CH:18]=[CH:17][N:16]=[CH:15][C:14]=4[N:13]=[CH:12]3)=[CH:30][CH:29]=2)[CH2:25][CH2:24][CH2:23][CH2:22][CH2:21]1

Participants

8

Reactant 3

HCID 2724254Sodium bis(trimethylsilyl)amideHCID 14797401N-cyclohexyl-N-methyl-4-bromomethylbenzamideHCID 178419860HCID 178419860, compound

Product 1

HCID 14369772N-cyclohexyl-N-methyl-4-(1H-imidazo[4,5-c]pyridinylmethyl)benzamideYield 5.6%

Reagents, catalysts & solvents 4

HCID 887MethanolSolvent2×HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

Sodium bis(trimethylsilyl)amide (22 ml of 1 M solution in THF) was added to a stirred solution of imidazo[4,5-c]pyridine (2.60 g, 0.02 mol) in dry THF (200 ml) under argon. A fine white precipitate formed. After 90 min. the mixture was treated with N-cyclohexyl-N-methyl 4-bromomethylbenzamide (6.20 g, 0.02 mol) dissolved in dry THF (50 ml). The mixture was allowed to warm to ambient temperature and stirred overnight. Methanol (1 ml) was added, followed by water and the product extracted using ethyl acetate (3×150 ml) The combined organic layers were washed,, with water (2×100 ml), dried over anhydrous potassium carbonate and the solvent removed to give the crude product. Flash chromatography (flash silica: 10% methanol in ethyl acetate) followed by repeated fractional crystallisation (6 times from ethyl acetate/DIPE) gave the desired regioisomer N-cyclohexyl-N-methyl 4-(1 H-imidazo[4,5-c]pyridylmethyl)benzamide (0.39 g, 5%) as an off white crystalline solid.

Workup

  1. customA fine white precipitate formed
  2. extractionthe product extracted
  3. washwere washed
  4. dry with materialwith water (2×100 ml), dried over anhydrous potassium carbonate
  5. customthe solvent removed
  6. customto give the crude product
  7. customcrystallisation (6 times from ethyl acetate/DIPE)

Sources & evidence

ORD record
ord-b036e55eb3c64136ba76b25923749624
Source dataset
uspto-grants-1994_01
Patent number
US05276153

Reaction notes

Loading…