Hydrochloric Acid → HCID 178452262, compound

HRID 907550Notes

Reaction equation

HRID 907550 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:19](Cl)=[N:18][CH:17]=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[OH-:21].[Na+].Cl>CS(C)=O.O>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:19]([OH:21])=[N:18][CH:17]=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 11150691Tert-butyl 4-(3-chloropyrazin-2-yl)piperazine-1-carboxylate

Product 1

HCID 178452262HCID 178452262, compound

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 962WaterSolvent

Procedure

To a solution of 3′-chloro-2,3,5,6-tetrahydro-[1,2′]bipyrazinyl-4-carboxylic acid tert-butyl ester (1.85 g, 6.19 mmol, prepared in Example 5a) in DMSO (6 mL) was added a 2.5M aqueous solution of NaOH (30 mL). The resulting suspension was heated to reflux for 12 h before allowing to cool to room temperature. The suspension was then diluted with water (20 mL), acidified to pH=5 with 6M HCl, and extracted with EtOAc. The organic phase was concentrated in vacuo and the resulting solids were purified by flash chromatography (silica gel, 5.5:1 EtOAc:Hexanes). Product 3′-Hydroxy-2,3,5,6-tetrahydro-[1,2′]bipyrazinyl-4-carboxylic acid tert-butyl ester was obtained as white solids (538 mg, 31.0%).

Workup

  1. temperatureThe resulting suspension was heated
  2. temperatureto reflux for 12 h
  3. extractionextracted with EtOAc
  4. concentrationThe organic phase was concentrated in vacuo
  5. customthe resulting solids were purified by flash chromatography (silica gel, 5.5:1 EtOAc:Hexanes)

Sources & evidence

ORD record
ord-fb8b0d1f4ab2462790f0c6b16c38c3d6
Source dataset
uspto-grants-2011_09
Patent number
US08013156B2

Reaction notes

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