Dimethylformamide → N-hydroxy-2-(R)-{[4-(5-chloropyridin-2-yl-oxy)piperidine-1-sulfonyl]amino}-3-methylbutyramide

HRID 842999Notes

Reaction equation

HRID 842999 reaction equation
C(Cl)(=O)C(Cl)=O.CN(C=O)C.[Cl:12][C:13]1[CH:14]=[CH:15][C:16]([O:19][CH:20]2[CH2:25][CH2:24][N:23]([S:26]([NH:29][C@H:30]([CH:34]([CH3:36])[CH3:35])[C:31]([OH:33])=O)(=[O:28])=[O:27])[CH2:22][CH2:21]2)=[N:17][CH:18]=1.C[Si](C)(C)[NH:39][O:40][Si](C)(C)C>C(Cl)Cl>[OH:40][NH:39][C:31](=[O:33])[C@H:30]([NH:29][S:26]([N:23]1[CH2:22][CH2:21][CH:20]([O:19][C:16]2[CH:15]=[CH:14][C:13]([Cl:12])=[CH:18][N:17]=2)[CH2:25][CH2:24]1)(=[O:28])=[O:27])[CH:34]([CH3:35])[CH3:36]

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 65578Oxalyl chlorideHCID 898151,1,1-trimethyl-N-((trimethylsilyl)oxy)silylamineHCID 187271352-(R)-{[4-(5-chloropyridin-2-yloxy)piperidine-1-sulfonyl]amino}-3-methylbutyric acid

Product 1

HCID 10069936N-hydroxy-2-(R)-{[4-(5-chloropyridin-2-yl-oxy)piperidine-1-sulfonyl]amino}-3-methylbutyramideYield 35%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Oxalyl chloride (0.58 ml, 6.7 mmol) and DMF (few drops) were added to a solution of (R)-2-{[4-(5-chloropyridin-2-yloxy)piperidine-1 sulfonyl)amino}-3-methylbutyric acid (1.05 g, 2.7 mmol), [prepared as described in Step 1 above], in methylene chloride (85 ml) and the reaction mixture was stirred overnight at RT. After removal of the organics, the residue was redissolved in methylene chloride (40 ml) and N,O-bis-trimethylsilylhydroxylamine (1.7 g, 9.4 mmol) was added. After 3 h, the reaction was concentrated, methanol (20 ml) was added and after stirring for an additional 30 min., the solvent was removed in vacuo. The residue was dissolved in ethyl acetate and washed with water and brine, dried over MgSO4, and concentrated. Chromatography (SiO2, 1-2% methanol/methylene chloride) gave N-hydroxy-2-(R)-{[4-(5-chloropyridin-2-yl-oxy)piperidine-1-sulfonyl]amino}-3-methylbutyramide as a white solid (35%), mp 97.0-98.4° C.

Workup

  1. customAfter removal of the organics, the residue
  2. dissolutionwas redissolved in methylene chloride (40 ml)
  3. waitAfter 3 h
  4. concentrationthe reaction was concentrated
  5. additionmethanol (20 ml) was added
  6. stirringafter stirring for an additional 30 min.
  7. customthe solvent was removed in vacuo
  8. dissolutionThe residue was dissolved in ethyl acetate
  9. washwashed with water and brine
  10. dry with materialdried over MgSO4
  11. concentrationconcentrated

Sources & evidence

ORD record
ord-7f7d99e016b447338c81546575ad9a69
Source dataset
uspto-grants-2002_04
Patent number
US06376506B1

Reaction notes

Loading…