Trifluoroacetic acid → (2S)-1-(1,3-benzoxazol-2-yl)-N2-2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamide

HRID 2298826Notes

Reaction equation

HRID 2298826 reaction equation
FC(F)(F)C(O)=O.[O:8]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:10]=[C:9]1[N:17]1[CH2:22][CH2:21][CH2:20][CH2:19][C@H:18]1[C:23]([NH:25][CH2:26][CH2:27][N:28]1[C@@H:33]([CH3:34])[CH2:32][N:31](C(OC(C)(C)C)=O)[CH2:30][C@H:29]1[CH3:42])=[O:24]>ClCCl>[O:8]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:10]=[C:9]1[N:17]1[CH2:22][CH2:21][CH2:20][CH2:19][C@H:18]1[C:23]([NH:25][CH2:26][CH2:27][N:28]1[C@H:33]([CH3:34])[CH2:32][NH:31][CH2:30][C@@H:29]1[CH3:42])=[O:24]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 12096137tert-butyl (cis)-4-[2-([(2S)-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)ethyl]-3,5-dimethyl-1-piperazinecarboxylate

Product 1

HCID 9821522(2S)-1-(1,3-benzoxazol-2-yl)-N2-2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamideYield 86.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Trifluoroacetic acid (10 ml) was added to a solution of tert-butyl (cis)-4-[2-([(2S)-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)ethyl]-3,5-dimethyl-1-piperazinecarboxylate (0.95 g) [see Preparation 8] in dichloromethane (10 ml) at 0° C. The reaction mixture was then stirred at room temperature for 1.5 hours, after which time the solvent was removed under reduced pressure and the residue partitioned between saturated potassium carbonate solution and ethyl acetate. The organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure. The product was azeotroped several times with dichloromethane to afford (2S)-1-(1,3-benzoxazol-2-yl)-N2-2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamide (0.65 g) as a white foam.

Workup

  1. customafter which time the solvent was removed under reduced pressure
  2. customthe residue partitioned between saturated potassium carbonate solution and ethyl acetate
  3. customThe organic layer was separated
  4. dry with materialdried over magnesium sulphate
  5. customthe solvent removed under reduced pressure
  6. customThe product was azeotroped several times with dichloromethane

Sources & evidence

ORD record
ord-10793d1040b44a0ab00db8372f3ebf9b
Source dataset
uspto-grants-2002_12
Patent number
US06495549B1

Reaction notes

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