Methylamine → 6-(4-Bromo-2-chloro-phenylamino)-7-fluoro-3H-benzoimidazole-5-carboxylic acid methylamide

HRID 2104041Notes

Reaction equation

HRID 2104041 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9]2[C:10]([C:20]([OH:22])=O)=[CH:11][C:12]3[N:16](C)[CH:15]=[N:14][C:13]=3[C:18]=2[F:19])=[C:4]([Cl:23])[CH:3]=1.C1C=CC2N(O)N=[N:30][C:28]=2C=1.C(N(CC)CC)C.CN.CCN=C=NCCCN(C)C>CN(C)C=O.C(OCC)(=O)C.O>[CH3:28][NH:30][C:20]([C:10]1[C:9]([NH:8][C:5]2[CH:6]=[CH:7][C:2]([Br:1])=[CH:3][C:4]=2[Cl:23])=[C:18]([F:19])[C:13]2[N:14]=[CH:15][NH:16][C:12]=2[CH:11]=1)=[O:22]

Participants

9

Reactant 5

HCID 6329MethylamineHCID 8471TriethylamineHCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 16092137AZ-133266637

Product 1

HCID 113954076-(4-Bromo-2-chloro-phenylamino)-7-fluoro-3H-benzoimidazole-5-carboxylic acid methylamideYield 43%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

6-(4-Bromo-2-chloro-phenylamino)-7-fluoro-3H-benzoimidazole-5-carboxylic acid 10c (0.029 g, 0.076 mmol) is dissolved in N,N-dimethylformamide (1.1 mL). HOBT (0.016 g, 0.10 mmol), triethylamine (0.028 mL, 0.20 mmol), methylamine (0.059 mL, 0.12 mmol, 2 M solution in tetrahydrofuran), and EDCI (0.019 g, 0.10 mmol) are added consecutively to the reaction mixture at room temperature. The solution is stirred at room temperature for 16 hours under N2. The reaction mixture is poured into a separatory funnel and diluted with ethyl acetate and water and the layers separated. The ethyl acetate layer is washed successively with aqueous saturated NH4Cl (2×), brine (1×), aqueous saturated sodium bicarbonate (2×), water (1×), and brine (1×), dried (MgSO4) and concentrated under reduced pressure. The resulting solid is purified by FCC (eluting with 19:1 methylene chloride:methanol) to yield 0.013 g (42%) of the pure desired product. MS APCI (+) m/z 397, 399 (M+, Br pattern) detected; 1H NMR (400 MHz, DMSO-d6) δ 8.76 (broad s, 1H), 8.69 (m, 1H), 8.41 (s, 1H), 7.76 (s, 1H), 7.63 (d, 1H), 7.30 (dd, 1H), 6.50 (dd, 1H), 2.76 and 2.75 (s and s, 3H total, amide rotamers). 19F NMR (376 MHz, DMSO-d6) −132.69 (s).

Workup

  1. additionThe reaction mixture is poured into a separatory funnel
  2. customthe layers separated
  3. washThe ethyl acetate layer is washed successively with aqueous saturated NH4Cl (2×), brine (1×), aqueous saturated sodium bicarbonate (2×), water (1×), and brine (1×)
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated under reduced pressure
  6. customThe resulting solid is purified by FCC (eluting with 19:1 methylene chloride:methanol)

Sources & evidence

ORD record
ord-85d36c6df1f94a34a5ff5a701c3c3827
Source dataset
uspto-grants-2009_08
Patent number
US07576114B2

Reaction notes

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