Imidazole → Tert-butyl 4-(4-fluoro-2-(2-iodoethylthio)-5-nitrophenylamino)piperidine-1-carboxylate

HRID 424595Notes

Reaction equation

HRID 424595 reaction equation
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N1C=CN=C1.[I:25]I.[F:27][C:28]1[C:33]([N+:34]([O-:36])=[O:35])=[CH:32][C:31]([NH:37][CH:38]2[CH2:43][CH2:42][N:41]([C:44]([O:46][C:47]([CH3:50])([CH3:49])[CH3:48])=[O:45])[CH2:40][CH2:39]2)=[C:30]([S:51][CH2:52][CH2:53]O)[CH:29]=1>O1CCCC1.C(OCC)(=O)C>[F:27][C:28]1[C:33]([N+:34]([O-:36])=[O:35])=[CH:32][C:31]([NH:37][CH:38]2[CH2:43][CH2:42][N:41]([C:44]([O:46][C:47]([CH3:50])([CH3:49])[CH3:48])=[O:45])[CH2:40][CH2:39]2)=[C:30]([S:51][CH2:52][CH2:53][I:25])[CH:29]=1

Participants

7

Reactant 4

HCID 795ImidazoleHCID 807IodineHCID 11776TriphenylphosphineHCID 59144085tert-Butyl 4-(4-fluoro-2-(2-hydroxyethylthio)-5-nitrophenylamino)piperidine-1-carboxylate

Product 1

HCID 59144096Tert-butyl 4-(4-fluoro-2-(2-iodoethylthio)-5-nitrophenylamino)piperidine-1-carboxylateYield 44.6%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

To a stirred solution of triphenylphosphine (668 mg, 2.55 mmol) and imidazole (0.693 mL, 5.09 mmol) in tetrahydrofuran (10 mL) cooled to 0° C. was added iodine (732 mg, 2.88 mmol). The resulting mixture was stirred at 0° C. for 5 minutes. To this mixture was then added tert-butyl 4-(4-fluoro-2-(2-hydroxyethylthio)-5-nitrophenylamino)piperidine-1-carboxylate (705 mg, 1.697 mmol) as a solution in tetrahydrofuran (5 mL), and the resulting mixture was stirred at room temperature for 20 minutes. The mixture was then diluted with ethyl acetate and washed with saturated sodium carbonate, water, saturated sodium thiosulfate, and brine. The organic phase was dried, filtered, concentrated, and then chromatographed in 1:9 ethyl acetate:hexanes to afford the desired product (398 mg, 44.6%). 1H NMR (DMSO-d6) δ 7.53 (d, J=11.7 Hz, 1H), 7.27 (d, J=6.6 Hz, 1H), 5.10 (d, J=8.1 Hz, 1H), 3.96-3.85 (m, 2H), 3.64-3.52 (m, 1H), 3.50-3.41 (m, 2H), 3.39-3.32 (m, 2H), 2.99-2.81 (m, 2H), 1.91-1.81 (m, 2H), 1.48-1.32 (m, 11H); ESI-MS (m.z, %): 470 (100), 426 (81).

Workup

  1. washwashed with saturated sodium carbonate, water, saturated sodium thiosulfate, and brine
  2. customThe organic phase was dried
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customchromatographed in 1:9 ethyl acetate

Sources & evidence

ORD record
ord-f22738a2e7fc4d949cf5fb929fea38d2
Source dataset
uspto-grants-2012_01
Patent number
US08106043B2

Reaction notes

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