Sodium Bicarbonate → Tert-butyl 4-{2-[4-(2-chloro-4-nitroimidazol-1-ylmethyl)-4-hydroxypiperidin-1-yl]-2-oxoethyl}piperazine-1-carboxylate

HRID 856372Notes

Reaction equation

HRID 856372 reaction equation
[Cl:1][C:2]1[NH:3][CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1.[O:10]1[C:12]2([CH2:17][CH2:16][N:15]([C:18](=[O:33])[CH2:19][N:20]3[CH2:25][CH2:24][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:22][CH2:21]3)[CH2:14][CH2:13]2)[CH2:11]1.C(=O)([O-])O.[Na+]>C(O)C>[Cl:1][C:2]1[N:3]([CH2:11][C:12]2([OH:10])[CH2:13][CH2:14][N:15]([C:18](=[O:33])[CH2:19][N:20]3[CH2:25][CH2:24][N:23]([C:26]([O:28][C:29]([CH3:31])([CH3:30])[CH3:32])=[O:27])[CH2:22][CH2:21]3)[CH2:16][CH2:17]2)[CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1

Participants

5

Reactant 3

HCID 516892Sodium BicarbonateHCID 23081320Tert-butyl 4-[2-(1-oxa-6-azaspiro[2,5]octan-6-yl)-2-oxoethyl]piperazine-1-carboxylateHCID 178526855HCID 178526855, compound

Product 1

HCID 23081304Tert-butyl 4-{2-[4-(2-chloro-4-nitroimidazol-1-ylmethyl)-4-hydroxypiperidin-1-yl]-2-oxoethyl}piperazine-1-carboxylateYield 61%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

2-Chloro-4-nitro-1H-imidazole (1.29 g, 8.76 mmol), tert-butyl 4-{2-(1-oxa-6-azaspiro[2,5]octan-6-yl)-2-oxoethyl}piperazine-1-carboxylate (2.97 g, 8.76 mmol) and sodium hydrogencarbonate (809 mg, 9.64 mmol) in ethanol (10 ml) was stirred under reflux for 5 hours. The reaction mixture was concentrated under reduced pressure, and a saturated sodium hydrogencarbonate solution was added. The solution was extracted with methylene chloride. The organic phase was dried over magnesium sulfate and then filtered. The resulting filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride/methanol=100/1) to afford tert-butyl 4-{2-[4-(2-chloro-4-nitroimidazol-1-ylmethyl)-4-hydroxypiperidin-1-yl]-2-oxoethyl}piperazine-1-carboxylate (2.58 g, yield 61%) as a yellow oil.

Workup

  1. temperatureunder reflux for 5 hours
  2. concentrationThe reaction mixture was concentrated under reduced pressure
  3. additiona saturated sodium hydrogencarbonate solution was added
  4. extractionThe solution was extracted with methylene chloride
  5. dry with materialThe organic phase was dried over magnesium sulfate
  6. filtrationfiltered
  7. concentrationThe resulting filtrate was concentrated under reduced pressure
  8. customthe residue was purified by silica gel column chromatography (methylene chloride/methanol=100/1)

Sources & evidence

ORD record
ord-640f1f099cdf4b07934d8e91c2d45ed7
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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