tert-Butyl 4-{1-[(benzoyloxy)carbonyl]piperidin-4-yl}-3-oxopiperazin-1-carboxylate → HCID 68416800, compound

HRID 20224Notes

Reaction equation

HRID 20224 reaction equation
[C:1]([O:9][C:10]([N:12]1[CH2:17][CH2:16][CH:15]([N:18]2[CH2:23][CH2:22][N:21]([C:24](OC(C)(C)C)=O)[CH2:20][C:19]2=[O:31])[CH2:14][CH2:13]1)=[O:11])(=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>FC(F)(F)C(O)=O.ClCCl>[CH3:24][N:21]1[CH2:22][CH2:23][N:18]([CH:15]2[CH2:16][CH2:17][N:12]([C:10]([O:9][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)=[O:11])[CH2:13][CH2:14]2)[C:19](=[O:31])[CH2:20]1

Participants

4

Reactant 1

HCID 86615672tert-Butyl 4-{1-[(benzoyloxy)carbonyl]piperidin-4-yl}-3-oxopiperazin-1-carboxylate

Product 1

HCID 68416800HCID 68416800, compoundYield 117.8%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 6422Trifluoroacetic acidSolvent

Procedure

tert-Butyl 4-{1-[(benzoyloxy)carbonyl]piperidin-4-yl}-3-oxopiperazin-1-carboxylate (0.42 g) obtained in Example 12b) was dissolved in trifluoroacetic acid (1 mL) and dichloromethane (1 mL), and the mixture was stirred at room temperature for one hour. The reaction mixture was concentrated, toluene was added to the residue and it was concentrated again under reduced pressure. The residue was dissolved in dichloromethane (15 mL) and formalin (37%; 0.5 mL) was added. After the reaction mixture was stirred at room temperature for 2 hours, sodium triacetoxyborohydride (0.53 g) was added, and the mixture was stirred at room temperature for 15 hours. The reaction mixture was washed with an aqueous sodium bicarbonate solution and dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure to obtain the title compound (0.38 g, quantitative) as a light yellow oil.

Workup

  1. concentrationThe reaction mixture was concentrated
  2. additiontoluene was added to the residue and it
  3. concentrationwas concentrated again under reduced pressure
  4. dissolutionThe residue was dissolved in dichloromethane (15 mL)
  5. additionformalin (37%; 0.5 mL) was added
  6. additionsodium triacetoxyborohydride (0.53 g) was added
  7. stirringthe mixture was stirred at room temperature for 15 hours
  8. washThe reaction mixture was washed with an aqueous sodium bicarbonate solution
  9. dry with materialdried over anhydrous sodium sulfate
  10. distillationthe solvent was distilled off under reduced pressure

Sources & evidence

ORD record
ord-407b690e9ee94ff4a98b7617e40b498f
Source dataset
uspto-grants-2010_06
Patent number
US07745623B2

Reaction notes

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