4-[5-(4-(benzyloxycarbonyl)piperazin-1-yl)pyridin-2-yl]-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester → 4-(5-(piperazin-1-yl)pyridin-2-yl)-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester

HRID 41707Notes

Reaction equation

HRID 41707 reaction equation
[C:1]([O:5][C:6]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:11]([C:18]2[CH:23]=[CH:22][C:21]([N:24]3[CH2:29][CH2:28][N:27](C(OCC4C=CC=CC=4)=O)[CH2:26][CH2:25]3)=[CH:20][N:19]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H][H]>C(O)C.[Pd]>[C:1]([O:5][C:6]([N:8]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[N:11]([C:18]2[CH:23]=[CH:22][C:21]([N:24]3[CH2:29][CH2:28][NH:27][CH2:26][CH2:25]3)=[CH:20][N:19]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 2

HCID 668631914-[5-(4-(benzyloxycarbonyl)piperazin-1-yl)pyridin-2-yl]-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl esterHCID 178418361HCID 178418361, compound

Product 1

HCID 668637824-(5-(piperazin-1-yl)pyridin-2-yl)-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl esterYield 94.1%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Procedure

5.08 g of 4-[5-(4-(benzyloxycarbonyl)piperazin-1-yl)pyridin-2-yl]-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester are placed in 240 ml of ethanol in a Parr bottle. 2 g of 10% Pd/C (50% in water) are added. The reaction medium is stirred at 35° C. under 45 psi hydrogen for 3.5 h. It is filtered on a Whatman filter under an inert atmosphere and then the filter residue is washed many times with methanol. The methanol is evaporated under reduced pressure. 3.57 g of 4-(5-(piperazin-1-yl)pyridin-2-yl)-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester are obtained.

Workup

  1. filtrationIt is filtered on a Whatman
  2. filtrationfilter under an inert atmosphere
  3. washthe filter residue is washed many times with methanol
  4. customThe methanol is evaporated under reduced pressure

Sources & evidence

ORD record
ord-b81eb3c379e34851af877e9d5afe5e4f
Source dataset
uspto-grants-2013_09
Patent number
US08530657B2

Reaction notes

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