2-Aminobenzimidazole → 2-(3-Nitrophenyl)benzo[4,5]imidazo[1,2-a]pyrimidine

HRID 2361495Notes

Reaction equation

[NH:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH2:10].CN(C)/[CH:13]=[CH:14]/[C:15]([C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([N+:23]([O-:25])=[O:24])[CH:18]=1)=O>CC(O)=O>[N+:23]([C:19]1[CH:18]=[C:17]([C:15]2[CH:14]=[CH:13][N:1]3[C:5]4[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=4[N:3]=[C:2]3[N:10]=2)[CH:22]=[CH:21][CH:20]=1)([O-:25])=[O:24]

Participants

Conditions

Temperature: 120 °C

Procedure

To a round bottomed flask equipped with a magnetic stir bar, containing AcOH (20 mL) was placed 1H-benzoimidazol-2-amine (1 g, 7.5 mmol, 1.0 equiv). To this solution was added (E)-3-(dimethylamino)-1-(3-nitrophenyl)prop-2-en-1-one (1.7 g, 7.5 mmol, 1 equiv) and the reaction was allowed to stir at 120° C. for 24 h. After the reaction was complete by LCMS, the solvent was completely evaporated and the reaction mixture was neutralized with NaHCO3 solution. Yellow solid was filtered and washed with DCM to give the nitro compound DHK-7-16 0.83 g (39%). MS (ESI, Pos.) m/z: 291.1 M+H]+.

Workup

customTo a round bottomed flask equipped with a magnetic stir bar
customthe solvent was completely evaporated
filtrationYellow solid was filtered
washwashed with DCM

Sources & evidence

ORD record: ord-84f5c49191eb40e98ac319cd334e1ac0
Source dataset: uspto-grants-2014_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08691187B2

Reaction notes

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