2,4-Dichloroaniline → Isopropyl {4-chloro-2-[(2,4-dichlorophenyl)amino]-7-(1-ethylpropyl)-1H-benzimidazol-1-yl}acetate

HRID 1628394Notes

Reaction equation

Cl[C:2]1[N:6]([CH2:7][C:8]([O:10][CH:11]([CH3:13])[CH3:12])=[O:9])[C:5]2[C:14]([CH:19]([CH2:22][CH3:23])[CH2:20][CH3:21])=[CH:15][CH:16]=[C:17]([Cl:18])[C:4]=2[N:3]=1.[Cl:24][C:25]1[CH:31]=[C:30]([Cl:32])[CH:29]=[CH:28][C:26]=1[NH2:27].C(=O)([O-])O.[Na+]>CN1CCCC1=O>[Cl:18][C:17]1[C:4]2[N:3]=[C:2]([NH:27][C:26]3[CH:28]=[CH:29][C:30]([Cl:32])=[CH:31][C:25]=3[Cl:24])[N:6]([CH2:7][C:8]([O:10][CH:11]([CH3:13])[CH3:12])=[O:9])[C:5]=2[C:14]([CH:19]([CH2:22][CH3:23])[CH2:20][CH3:21])=[CH:15][CH:16]=1

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of isopropyl [2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]acetate (Reference Example 10; 1.96 g, 5.49 mmol), 2,4-dichloroaniline (2.67 g, 16.5 mmol) and N-methyl-2-pyrrolidinone (1.5 mL) was stirred at 100° C. for 15 hr. After cooling, the reaction mixture was neutralized with saturated aqueous sodium hydrogen carbonate and extracted with ethyl acetate. The organic layer was washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 3-15% ethyl acetate/n-hexane gradient mixture to give the title compound (546 mg, 1.13 mmol, 21%) as an oil.

Workup

temperatureAfter cooling
extractionextracted with ethyl acetate
washThe organic layer was washed with water and brine
dry with materialdried over anhydrous sodium sulfate
concentrationconcentrated in vacuo
customThe residue was purified by silica gel column chromatography
washeluting with a 3-15% ethyl acetate/n-hexane gradient mixture

Sources & evidence

ORD record: ord-bc1f7f3ea7a54943a396a513c19472c6
Source dataset: uspto-grants-2014_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08785460B2

Reaction notes

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