Pyridine → 1-[8-Chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-5-yl]propyl acetate

HRID 1628950Notes

Reaction equation

HRID 1628950 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:14]4[C:19]([CH3:20])=[CH:18][C:17]([Cl:21])=[CH:16][C:15]=4[Cl:22])[CH2:12][CH2:13][N:7]3[C:6]=2[C:5]([CH:23]([OH:26])[CH2:24][CH3:25])=[CH:4][CH:3]=1.N1C=CC=CC=1.[C:33](OC(=O)C)(=[O:35])[CH3:34]>O1CCCC1>[C:33]([O:26][CH:23]([C:5]1[C:6]2[N:7]3[CH2:13][CH2:12][N:11]([C:14]4[C:19]([CH3:20])=[CH:18][C:17]([Cl:21])=[CH:16][C:15]=4[Cl:22])[C:8]3=[N:9][C:10]=2[C:2]([Cl:1])=[CH:3][CH:4]=1)[CH2:24][CH3:25])(=[O:35])[CH3:34]

Participants

5

Reactant 3

HCID 1049Pyridine2×HCID 7918Acetic Anhydride2×HCID 577861551-[8-chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-5-yl]propan-1-ol

Product 1

HCID 577859711-[8-Chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-5-yl]propyl acetateYield 70.4%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 1-[8-chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-5-yl]propan-1-ol (150 mg, 0.365 mmol) and pyridine (0.15 mL, 1.85 mmol) in tetrahydrofuran (10 mL) was added acetic anhydride (0.113 mL, 1.20 mmol) at room temperature. The mixture was stirred at room temperature for 5 hr. Then the mixture was warmed to 45° C. and stirred at 45° C. for 16 hr. Acetic anhydride (0.113 mL, 1.2 mmol) and pyridine (0.30 mL, 3.71 mmol) were added to the reaction mixture at room temperature. The mixture was stirred at 45° C. for 20 hr. The reaction mixture was concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture and recrystallization from 2-propanol/n-hexane to give the title compound (116.5 mg, 0.257 mmol, 60%) as colorless crystals.

Workup

  1. temperatureThen the mixture was warmed to 45° C.
  2. stirringstirred at 45° C. for 16 hr
  3. stirringThe mixture was stirred at 45° C. for 20 hr
  4. concentrationThe reaction mixture was concentrated in vacuo
  5. customThe residue was purified by flash chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture and recrystallization from 2-propanol/n-hexane

Sources & evidence

ORD record
ord-9885493a498b4b8b9daf83bc98b8ef93
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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