Oxalic Acid → (E)-3-Methoxystyryl-1-(2-pyridyl)-1H-benzimidazole oxalate

HRID 50892Notes

Reaction equation

HRID 50892 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[NH:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[NH2:14].[CH3:15][O:16][C:17]1[CH:18]=[C:19]([CH:25]=[CH:26][CH:27]=1)[CH:20]=[CH:21][C:22](Cl)=O.N1C=CC=CC=1N1C2C=CC=CC=2N=C1/C=C/C1C=CC=CC=1.[C:51]([OH:56])(=[O:55])[C:52]([OH:54])=[O:53]>C(OCC)(=O)C>[C:51]([OH:56])(=[O:55])[C:52]([OH:54])=[O:53].[CH3:15][O:16][C:17]1[CH:18]=[C:19]([CH:25]=[CH:26][CH:27]=1)/[CH:20]=[CH:21]/[C:22]1[N:7]([C:2]2[CH:3]=[CH:4][CH:5]=[CH:6][N:1]=2)[C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=2[N:14]=1

Participants

6

Reactant 4

HCID 971Oxalic AcidHCID 752150N1-(pyridin-2-yl)benzene-1,2-diamineHCID 9796241(E)-1-(2-pyridyl)-2-styryl-1H-benzimidazoleHCID 543303913-Methoxycinnamoyl Chloride

Product 1

HCID 69911914(E)-3-Methoxystyryl-1-(2-pyridyl)-1H-benzimidazole oxalate

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

Free base of the titled compound was prepared from N-(2-pyridyl)-o-phenylenediamine and 3-methoxycinnamoyl chloride (Amino, Y.; Kawada, K.; Toi, K.; Kumashiro, I.; Fukushima, K. Chem. Pharm. Bull., 1988, 36, 4426) according to the preparation of (E)-1-(2-pyridyl)-2-styryl-1H-benzimidazole (Example 1, method A). The free base and oxalic acid were dissolved into ethyl acetate. Concentration and recrystallization from ethyl acetate/n-hexane yielded the titled compound. MW: 417.42; mp: 163.0-164.0° C.; 1H-NMR (DMSO) δ: 8.78 (1H, dd, J=4.9, 1.3 Hz), 8.19 (1H, td, J=7.9, 2.0 Hz), 7.87 (1H, d, J=15.8 Hz), 7.77-7.72 (2H, m), 7.67-7.61 (1H, m), 7.48-7.44 (1H, m), 7.36-7.24 (3H, m), 7.22-7.15 (3H, m), 6.96-6.92 (1H, m), 3.78 (3H, s).

Workup

  1. concentrationConcentration and recrystallization from ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-5705bb127b0745589b4e4783923959db
Source dataset
uspto-grants-2004_03
Patent number
US06713482B2

Reaction notes

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