Cesium carbonate → 3-Bromo-5-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)isonicotinaldehyde

HRID 592515Notes

Reaction equation

HRID 592515 reaction equation
[C:1]1(=[O:14])[C:6]2=[CH:7][C:8]3[CH2:9][CH2:10][CH2:11][CH2:12][C:13]=3[N:5]2[CH2:4][CH2:3][NH:2]1.Br[C:16]1[CH:23]=[N:22][CH:21]=[C:20]([Br:24])[C:17]=1[CH:18]=[O:19].C1(P(C2C=CC=CC=2)C2C3OC4C(=CC=CC=4P(C4C=CC=CC=4)C4C=CC=CC=4)C(C)(C)C=3C=CC=2)C=CC=CC=1.C([O-])([O-])=O.[Cs+].[Cs+]>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].O1CCOCC1>[Br:24][C:20]1[CH:21]=[N:22][CH:23]=[C:16]([N:2]2[CH2:3][CH2:4][N:5]3[C:13]4[CH2:12][CH2:11][CH2:10][CH2:9][C:8]=4[CH:7]=[C:6]3[C:1]2=[O:14])[C:17]=1[CH:18]=[O:19]

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 27629983,5-Dibromo-4-pyridinecarboxaldehydeHCID 580439603,4,6,7,8,9-Hexahydropyrazino[1,2-a]indol-1(2H)-one

Product 1

HCID 866841693-Bromo-5-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)isonicotinaldehydeYield 59.6%

Reagents, catalysts & solvents 2

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

Conditions

Temperature
100 °C

Procedure

A 50-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 101e (300 mg, 1.57 mmol), 3,5-dibromoisonicotinaldehyde (2) (517 mg, 1.96 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (XantPhos, 120 mg, 0.2 mmol), tris(dibenzylideneacetone)dipalladium(0) (180 mg, 0.2 mmol), Cs2CO3 (650 mg, 2 mmol), and 1,4-dioxane (8 mL). After three cycles of vacuum/argon flush, the mixture was heated at 100° C. for 6 h. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the resulting residue was purified by flash column chromatography eluting with DCM/MeOH (from 40:1 to 20:1) to afford 101f as a pale yellow solid (350 mg, 40%). MS: [M+H]+ 374.

Workup

  1. customA 50-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter three cycles of vacuum/argon flush
  3. temperatureIt was then cooled to room temperature
  4. filtrationfiltered
  5. concentrationThe filtrate was concentrated under reduced pressure
  6. customthe resulting residue was purified by flash column chromatography
  7. washeluting with DCM/MeOH (from 40:1 to 20:1)

Sources & evidence

ORD record
ord-a7ddb2f29ff94a099439fef7531db4c8
Source dataset
uspto-grants-2016_01
Patent number
US09238655B2

Reaction notes

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