Diisopropylethylamine → (R)-tert-butyl 4-((2-bromo-7-carbamoylimidazo[1,2-b]pyridazin-8-yl)amino)-3,3-dimethylpiperidine-1-carboxylate

HRID 1487328Notes

Reaction equation

HRID 1487328 reaction equation
[Br:1][C:2]1[N:3]=[C:4]2[C:9](Cl)=[C:8]([C:11]([NH2:13])=[O:12])[CH:7]=[N:6][N:5]2[CH:14]=1.[NH2:15][C@@H:16]1[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][C:17]1([CH3:30])[CH3:29].CCN(C(C)C)C(C)C>CN(C=O)C>[Br:1][C:2]1[N:3]=[C:4]2[C:9]([NH:15][C@@H:16]3[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][C:17]3([CH3:30])[CH3:29])=[C:8]([C:11](=[O:12])[NH2:13])[CH:7]=[N:6][N:5]2[CH:14]=1

Participants

5

Reactant 3

HCID 81531DiisopropylethylamineHCID 68945318(R)-Tert-butyl 4-amino-3,3-dimethylpiperidine-1-carboxylateHCID 899954732-Bromo-8-chloro-imidazo[1,2-b]pyridazine-7-carboxamide

Product 1

HCID 89995471(R)-tert-butyl 4-((2-bromo-7-carbamoylimidazo[1,2-b]pyridazin-8-yl)amino)-3,3-dimethylpiperidine-1-carboxylateYield 88.5%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
90 °C

Procedure

To a solution of 2-bromo-8-chloroimidazo[1,2-b]pyridazine-7-carboxamide (170 mg, 0.617 mmol) and (R)-tert-butyl 4-amino-3,3-dimethylpiperidine-1-carboxylate (144 mg, 0.633 mmol) in DMF (1543 μl) was added DIEA (237 μl, 1.358 mmol). The reaction was heated at 90° C. for 2 hours. After cooling to room temperature, the reaction mixture was partitioned between water and ethyl acetate (100 ml). The ethyl acetate layer was washed with water (3×100 ml), dried with sodium sulfate, filtered, and concentrated under reduced pressure. The crude solid was purified via flash chromatography (ISCO silica gel column, 0-10% MeOH-DCM) to afford (R)-tert-butyl 4-((2-bromo-7-carbamoylimidazo[1,2-b]pyridazin-8-yl)amino)-3,3-dimethylpiperidine-1-carboxylate (255 mg, 0.546 mmol, 88% yield) as a faint yellow solid. ESI-MS (analytical LCMS Method A): m/z 467.0 ([M+H]+). HPLC (analytical HPLC Method A) Rt: 3.413 min.

Workup

  1. temperatureAfter cooling to room temperature
  2. customthe reaction mixture was partitioned between water and ethyl acetate (100 ml)
  3. washThe ethyl acetate layer was washed with water (3×100 ml)
  4. dry with materialdried with sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe crude solid was purified via flash chromatography (ISCO silica gel column, 0-10% MeOH-DCM)

Sources & evidence

ORD record
ord-7c640fddc5b544929ceef4c15469be55
Source dataset
uspto-grants-2016_08
Patent number
US09428511B2

Reaction notes

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