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Cesium carbonate → tert-butyl N-[(3S)-1-(6-bromo-4-methyl-3-oxo-pyrazin-2-yl)-3-piperidyl]carbamate

HRID 57955
Notes
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Reaction equation

HRID 57955 reaction equation
Br[C:2]1[C:3](=[O:10])[N:4]([CH3:9])[CH:5]=[C:6]([Br:8])[N:7]=1.[NH:11]1[CH2:16][CH2:15][CH2:14][C@H:13]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:23])([CH3:22])[CH3:21])[CH2:12]1.C(=O)([O-])[O-].[Cs+].[Cs+].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>O1CCOCC1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[Br:8][C:6]1[N:7]=[C:2]([N:11]2[CH2:16][CH2:15][CH2:14][C@H:13]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:22])([CH3:21])[CH3:23])[CH2:12]2)[C:3](=[O:10])[N:4]([CH3:9])[CH:5]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 1514171tert-butyl N-[(3S)-piperidin-3-yl]carbamateHCID 130629693,5-Dibromo-1-methyl-1H-pyrazin-2-one

Product 1

HCID 86707139tert-butyl N-[(3S)-1-(6-bromo-4-methyl-3-oxo-pyrazin-2-yl)-3-piperidyl]carbamate
Yield 58%

Reagents, catalysts & solvents 2

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 3,5-dibromo-1-methyl-pyrazin-2-one (2.025 mmol; 542.4 mg), tert-butyl N-[(3S)-3-piperidyl]carbamate (2.025 mmol; 405.5 mg), cesium carbonate (4.049 mmol; 1319 mg), Xantphos (0.1721 mmol; 102.7 mg), and tris(dibenzylideneacetone)dipalladium(0) (0.1012 mmol; 93.63 mg) in 1,4-dioxane (10 mL) was purged with Argon, then sealed and stirred at 110° C. overnight. The mixture was cooled to room temperature and filtered through Celite. The filtrate was concentrated and the residue was purified on silica eluted with 0 to 20% EtOAc in DCM to afford tert-butyl N-[(3S)-1-(6-bromo-4-methyl-3-oxo-pyrazin-2-yl)-3-piperidyl]carbamate as a yellow solid (451.0 mg, 58%).

Workup

  1. customwas purged with Argon
  2. customsealed
  3. temperatureThe mixture was cooled to room temperature
  4. filtrationfiltered through Celite
  5. concentrationThe filtrate was concentrated
  6. customthe residue was purified on silica
  7. washeluted with 0 to 20% EtOAc in DCM

Sources & evidence

ORD record
ord-0a71d5f08abc4687828e33cf2da6af07
Source dataset
uspto-grants-2016_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09434725B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes