Acetic Acid → (5-Chloro-2-{2-[4-(4-fluoro-benzyl)-(2R,5S)-2,5-dimethyl-piperazin-1-yl]-2-oxo-ethoxy}-pyridin-3-ylamino)-acetic Acid Ethyl Ester

HRID 11720

Reaction equation

HRID 11720 reaction equation
[NH2:1][C:2]1[C:3]([O:9][CH2:10][C:11]([N:13]2[CH2:18][C@H:17]([CH3:19])[N:16]([CH2:20][C:21]3[CH:26]=[CH:25][C:24]([F:27])=[CH:23][CH:22]=3)[CH2:15][C@H:14]2[CH3:28])=[O:12])=[N:4][CH:5]=[C:6]([Cl:8])[CH:7]=1.[C:29]([O:33][CH2:34][CH3:35])(=[O:32])[CH:30]=O.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([BH3-])#N.[Na+]>ClCCCl.O>[CH2:34]([O:33][C:29](=[O:32])[CH2:30][NH:1][C:2]1[C:3]([O:9][CH2:10][C:11]([N:13]2[CH2:18][C@H:17]([CH3:19])[N:16]([CH2:20][C:21]3[CH:22]=[CH:23][C:24]([F:27])=[CH:25][CH:26]=3)[CH2:15][C@H:14]2[CH3:28])=[O:12])=[N:4][CH:5]=[C:6]([Cl:8])[CH:7]=1)[CH3:35]

Participants

8

Reactant 5

HCID 176Acetic Acid2×HCID 70211Ethyl oxoacetate2×HCID 5003444Sodium cyanoborohydrideHCID 5049666Sodium triacetoxyborohydrideHCID 696555902-(3-Amino-5-chloro-pyridin-2-yloxy)-1-[4-(4-fluoro-benzyl)-(2R,5S)-2,5-dimethyl-piperazin-1-yl]-ethanone

Product 1

HCID 69655410(5-Chloro-2-{2-[4-(4-fluoro-benzyl)-(2R,5S)-2,5-dimethyl-piperazin-1-yl]-2-oxo-ethoxy}-pyridin-3-ylamino)-acetic Acid Ethyl EsterYield 66.3%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 962WaterSolvent

Procedure

To a solution of 2-(3-amino-5-chloro-pyridin-2-yloxy)-1-[4-(4-fluoro-benzyl)-(2R,5S)-2,5-dimethyl-piperazin-1-yl]-ethanone (0.105 g, 0.26 mmol) in 1,2-dichloroethane (2 mL) was added ethyl glyoxylate (0.050 mL, ˜0.5 mmol, 50% solution in toluene), acetic acid (0.016 mL, 0.28 mmol) and sodium triacetoxyborohydride (0.085 g, 0.40 mmol). The reaction was stirred at ambient temperature for 18 hours. Additional ethyl glyoxylate (0.050 mL, ˜0.5 mmol, 50% solution in toluene) and acetic acid (0.016 mL, 0.28 mmol) were added and the reaction was warmed to reflux for 3 hours. The reaction was then cooled to ambient temperature, sodium cyanoborohydride (˜0.030 g, 0.48 mmol) was added and the reaction was stirred at ambient temperature for 18 hours. The reaction was diluted with water and extracted with methylene chloride. The organic layer was dried over magnesium sulfate, filtered and concentrated in vacuo. Flash chromatography on silica gel provided the title compound (0.085 g).

Workup

  1. temperaturethe reaction was warmed
  2. temperatureto reflux for 3 hours
  3. temperatureThe reaction was then cooled to ambient temperature
  4. stirringthe reaction was stirred at ambient temperature for 18 hours
  5. extractionextracted with methylene chloride
  6. dry with materialThe organic layer was dried over magnesium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-f0f58e90bcac4453b21715f59bac8cc4
Source dataset
uspto-grants-2006_08
Patent number
US07098212B2

Linked notes

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