Ethanol → HCID 178489868, compound

HRID 416815Notes

Reaction equation

HRID 416815 reaction equation
[Br:1][C:2]1[C:3]([N:12]2[CH2:17][CH2:16][N:15]([CH2:18][C:19]3[CH:23]=[C:22]([CH3:24])[O:21][N:20]=3)[CH2:14][CH2:13]2)=[C:4]([N+:9]([O-])=O)[C:5]([NH2:8])=[N:6][CH:7]=1.CCO.[CH3:28][O:29][C:30]1[CH:31]=[C:32]([CH:35]=[CH:36][CH:37]=1)[CH:33]=O.[O-]S(S([O-])=O)=O.[Na+].[Na+]>C(OCC)C>[Br:1][C:2]1[C:3]([N:12]2[CH2:17][CH2:16][N:15]([CH2:18][C:19]3[CH:23]=[C:22]([CH3:24])[O:21][N:20]=3)[CH2:14][CH2:13]2)=[C:4]2[N:9]=[C:33]([C:32]3[CH:35]=[CH:36][CH:37]=[C:30]([O:29][CH3:28])[CH:31]=3)[NH:8][C:5]2=[N:6][CH:7]=1

Participants

6

Reactant 4

HCID 702Ethanol2×HCID 115693-MethoxybenzaldehydeHCID 24489Sodium DithioniteHCID 468687835-Bromo-4-[4-(5-methyl-isoxazol-3-ylmethyl)-piperazin-1-yl]-3-nitro-pyridin-2-ylamine

Product 1

HCID 178489868HCID 178489868, compound

Reagents, catalysts & solvents 1

HCID 3283Diethyl EtherSolvent

Conditions

Temperature
80 °C

Procedure

To a mixture of 5-bromo-4-[4-(5-methyl-isoxazol-3-ylmethyl)-piperazin-1-yl]-3-nitro-pyridin-2-ylamine (0.040 g, 0.10 mmol) and EtOH (3 ml) was added 3-methoxybenzaldehyde (0.022 g, 0.16 mmol) with the aid of EtOH (1 ml), followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.40 ml, 0.40 mmol). The reaction mixture was stirred at 80° C. for 20 h, then allowed to cool to room temperature and concentrated in vacuo. The resulting residue was absorbed on silica, and the free-running powder was placed on a 10 g isolute silica column. Elution with ethyl acetate/dichloromethane (v:v; 3:7) and then a gradient of methanol (0 to 2%) in ethyl acetate/dichloromethane (v:v; 1:1) afforded a yellowish solid. The title compound was obtained as a white solid after trituration with diethyl ether (0.010 g, 21%); 1H-NMR (500 MHz, DMSO-d6) 2.40 (s, 3H, isoxazole 5-CH3), 2.64 (br s, 4H, piperazine N(CH2)2), 3.60 (s, 2H, NCH2 isoxazole), 3.67 (br s, 4H, piperazine N(CH2)2), 3.85 (s, 3H, OCH3), 6.25 (s, 1H, isoxazole 4-H), 7.09 (dd, J=1.9, 8.3 Hz, 1H, PhH), 7.45 (t, J=8.3 Hz, 1H, Ph 5-H), 7.76 (s, 1H, Ph 2-H), 7.79 (d, J=8.3 Hz, PhH), 8.24 (s, 1H, imidazo[4,5-b]pyridine 5-H), 13.50 (br s, 1H, imidazo[4,5-b]pyridine N—H);

Workup

  1. temperatureto cool to room temperature
  2. concentrationconcentrated in vacuo
  3. customThe resulting residue was absorbed on silica
  4. washElution with ethyl acetate/dichloromethane (v:v; 3:7)
  5. customa gradient of methanol (0 to 2%) in ethyl acetate/dichloromethane (v:v; 1:1) afforded a yellowish solid

Sources & evidence

ORD record
ord-2ea68af251c849189f2172438c050bfb
Source dataset
uspto-grants-2012_01
Patent number
US08088761B2

Reaction notes

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