Potassium Carbonate → Ammonia

HRID 2298829Notes

Reaction equation

HRID 2298829 reaction equation
[CH:1]([N:4]=[C:5]=[O:6])([CH3:3])[CH3:2].[O:7]1[C:11]2[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=2[N:9]=[C:8]1[N:16]1[CH2:21][CH2:20][CH2:19][CH2:18][C@H:17]1[C:22]([NH:24][CH2:25][CH2:26][N:27]1[C@H:32]([CH3:33])[CH2:31][NH:30][CH2:29][C@@H:28]1[CH3:34])=[O:23].C(=O)([O-])[O-].[K+].[K+]>C(#N)C>[NH3:4].[O:7]1[C:11]2[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=2[N:9]=[C:8]1[N:16]1[CH2:21][CH2:20][CH2:19][CH2:18][C@H:17]1[C:22]([NH:24][CH2:25][CH2:26][N:27]1[C@@H:32]([CH3:33])[CH2:31][N:30]([C:5]([NH:4][CH:1]([CH3:3])[CH3:2])=[O:6])[CH2:29][C@H:28]1[CH3:34])=[O:23]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 61277Isopropyl isocyanateHCID 9821522(2S)-1-(1,3-benzoxazol-2-yl)-N2-2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamide

Product 2

HCID 222AmmoniaHCID 9869349(cis)-4-[2-([(2S)-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)ethyl]-N1-isopropyl-3,5-dimethyl-1-piperazinecarboxamide

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

Isopropylisocyanate (0.029 ml) was added to a solution of (2S)-1-(1,3-benzoxazol-2-yl)-N2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamide (105 mg) [see Example 8] and potassium carbonate (37.5 mg) in acetonitrile (3 ml). The reaction mixture was stirred at room temperature for 5 hours, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water. The organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure. The crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 94.6:5.6:0.8 changing to 93:7:1, by volume, dichloromethane:methanol: 0.88 aqueous ammonia solution to afford (cis)-4-[2-([(2S)-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)ethyl]-N1-isopropyl-3,5-dimethyl-1-piperazinecarboxamide (72.8 mg) as a white solid.

Workup

  1. customafter which time the solvent was removed under reduced pressure
  2. customthe residue partitioned between ethyl acetate and water
  3. customThe organic layer was separated
  4. dry with materialdried over magnesium sulphate
  5. customthe solvent removed under reduced pressure
  6. customThe crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 94.6:5.6:0.8 changing to 93:7:1, by volume, dichloromethane

Sources & evidence

ORD record
ord-2a589a4eb91c4582bd5151f51c1708cf
Source dataset
uspto-grants-2002_12
Patent number
US06495549B1

Reaction notes

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