Tert-butyl 4-carbamoyl-4-fluoropiperidine-1-carboxylate → 4-({[6-Butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carbonyl]-amino}-methyl)-4-fluoro-piperidine-1-carboxylic acid tert-butyl ester

HRID 1972078Notes

Reaction equation

HRID 1972078 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11]([C:15](=O)[NH2:16])([F:14])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].FC1C([O:25][C:26]([C:28]2[N:29]=[N:30][C:31]([CH2:47][CH2:48][CH2:49][CH3:50])=[C:32]([C:34]3[CH:39]=[CH:38][C:37]([O:40][CH:41]4[CH2:46][CH2:45][CH2:44][CH2:43][CH2:42]4)=[CH:36][CH:35]=3)[CH:33]=2)=O)=C(F)C(F)=C(F)C=1F>C1COCC1.C(OCC)(=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11]([CH2:15][NH:16][C:26]([C:28]2[N:29]=[N:30][C:31]([CH2:47][CH2:48][CH2:49][CH3:50])=[C:32]([C:34]3[CH:39]=[CH:38][C:37]([O:40][CH:41]4[CH2:42][CH2:43][CH2:44][CH2:45][CH2:46]4)=[CH:36][CH:35]=3)[CH:33]=2)=[O:25])([F:14])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 2

HCID 46942209Tert-butyl 4-carbamoyl-4-fluoropiperidine-1-carboxylateHCID 866578236-Butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carboxylic acid pentafluorophenyl ester

Product 1

HCID 673732664-({[6-Butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carbonyl]-amino}-methyl)-4-fluoro-piperidine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 4-carbamoyl-4-fluoro-piperidine-1-carboxylic acid tert-butyl ester (1.01 mmol, 0.25 g) in THF (4.0 mL), was added BH3:THF (2 mL, 1M solution in THF) and stirred for 12 h. All volatiles were removed under reduced pressure. The residue was taken in DCM (2 mL) and 6-butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carboxylic acid pentafluorophenyl ester (Example 93, 0.29 mmol, 0.15 g) was added followed by TEA (0.5 mL), and the reaction mixture was stirred at room temperature for 3 h. The reaction mixture was diluted with ethyl acetate (20 mL), and washed with NaOH (0.5 M) solution (2×5 mL) water (2×5 mL), brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was purified by flash silica gel column chromatography using ethyl acetate:hexanes (3:7) to provide 4-({[6-butyl-5-(4-cyclohexyloxy-phenyl)-pyridazine-3-carbonyl]-amino}-methyl)-4-fluoro-piperidine-1-carboxylic acid tert-butyl ester.

Workup

  1. customAll volatiles were removed under reduced pressure
  2. washwashed with NaOH (0.5 M) solution (2×5 mL) water (2×5 mL), brine
  3. dry with materialdried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by flash silica gel column chromatography

Sources & evidence

ORD record
ord-923340b3fbff42b0bf829f196ba0d364
Source dataset
uspto-grants-2013_04
Patent number
US08431575B2

Reaction notes

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