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Cesium carbonate → 3-Bromo-5-(1-oxo-6,7,8,9-tetrahydropyrazino[1,2-a]indol-2(1H)-yl)isonicotinaldehyde

HRID 1021691
Notes
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Reaction equation

HRID 1021691 reaction equation
Br[C:2]1[CH:9]=[N:8][CH:7]=[C:6]([Br:10])[C:3]=1[CH:4]=[O:5].[C:11]1(=[O:24])[C:16]2=[CH:17][C:18]3[CH2:19][CH2:20][CH2:21][CH2:22][C:23]=3[N:15]2[CH:14]=[CH:13][NH:12]1.C(=O)([O-])[O-].[Cs+].[Cs+].COC1C2C(=C3C(=CC=2)C(OC)=CC=N3)N=CC=1>[Cu]I.O1CCOCC1>[Br:10][C:6]1[CH:7]=[N:8][CH:9]=[C:2]([N:12]2[CH:13]=[CH:14][N:15]3[C:23]4[CH2:22][CH2:21][CH2:20][CH2:19][C:18]=4[CH:17]=[C:16]3[C:11]2=[O:24])[C:3]=1[CH:4]=[O:5]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 27629983,5-Dibromo-4-pyridinecarboxaldehydeHCID 104622984,7-Dimethoxy-1,10-phenanthrolineHCID 866837556,7,8,9-Tetrahydropyrazino[1,2-a]indol-1(2H)-one

Product 1

HCID 866842233-Bromo-5-(1-oxo-6,7,8,9-tetrahydropyrazino[1,2-a]indol-2(1H)-yl)isonicotinaldehydeYield 35.4%

Reagents, catalysts & solvents

2
HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and reflux condenser was charged with 1,4-dioxane (15 mL), 3,5-dibromoisonicotinaldehyde (604 mg, 2.28 mmol), 6,7,8,9-tetrahydropyrazino[1,2-a]indol-1(2H)-one (142 mg, 0.76 mmol) and cesium carbonate (485 mg, 1.5 mmol). CuI (143 mg, 0.76 mmol) and 4,7-dimethoxy-1,10-phenanthroline (127 mg, 0.52 mmol) were added, and the reaction mixture was heated at 100° C. for 5 h. After this time, the reaction was cooled to room temperature. It was then filtered and the filtrate was concentrated under reduced pressure. The residue was purified on flash column eluting with EtOAC/PE (1:2) to afford 126a (100 mg, 35%) as a yellow solid. MS: [M+H]+ 372.

Workup

  1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer
  2. temperaturereflux condenser
  3. temperatureAfter this time, the reaction was cooled to room temperature
  4. filtrationIt was then filtered
  5. concentrationthe filtrate was concentrated under reduced pressure
  6. customThe residue was purified on flash column
  7. washeluting with EtOAC/PE (1:2)

Sources & evidence

ORD record
ord-6b3bd711d12c4fc19f2543b0cd057c78
Source dataset
uspto-grants-2014_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08716274B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes