Triethylamine → 3-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]pentanenitrile

HRID 1628856Notes

Reaction equation

HRID 1628856 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][C:16]=4[Cl:22])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:23]([CH2:28][CH3:29])[CH2:24][C:25]([NH2:27])=O)=[CH:4][CH:3]=1.C(N(CC)CC)C.FC(F)(F)C(OC(=O)C(F)(F)F)=O>O1CCCC1.C(OCC)(=O)C>[Cl:1][C:2]1[C:10]2[N:9]=[C:8]3[N:11]([C:15]4[CH:20]=[CH:19][C:18]([Cl:21])=[CH:17][C:16]=4[Cl:22])[CH2:12][CH2:13][CH2:14][N:7]3[C:6]=2[C:5]([CH:23]([CH2:28][CH3:29])[CH2:24][C:25]#[N:27])=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 8471TriethylamineHCID 9845Trifluoroacetic anhydrideHCID 577860343-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]pentanamide

Product 1

HCID 577861263-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]pentanenitrile

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred solution of 3-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]pentanamide (60.1 mg, 0.133 mmol) and triethylamine (112 μL, 0.800 mmol) in tetrahydrofuran (1.5 mL) was added trifluoroacetic anhydride (55.6 μL, 0.400 mmol) at 0° C. After 0.5 h, the reaction mixture was diluted with ethyl acetate, washed with brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 0-70% ethyl acetate/n-hexane gradient mixture give the title compound as a colorless amorphous (45.1 mg, 0.104 mmol, 78%).

Workup

  1. washwashed with brine
  2. dry with materialdried over sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by flash column chromatography on silica gel eluting with a 0-70% ethyl acetate/n-hexane gradient mixture

Sources & evidence

ORD record
ord-3972d2e9447144f5b8fe38b2a8532014
Source dataset
uspto-grants-2014_07
Patent number
US08785460B2

Reaction notes

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