Cesium carbonate → 2-bromo-4-fluoro-6-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)benzyl acetate

HRID 1024010Notes

Reaction equation

HRID 1024010 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.[C:15]([O:18][CH2:19][C:20]1[C:25]([Br:26])=[CH:24][C:23]([F:27])=[CH:22][C:21]=1Br)(=[O:17])[CH3:16].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.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>[C:15]([O:18][CH2:19][C:20]1[C:21]([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])=[CH:22][C:23]([F:27])=[CH:24][C:25]=1[Br:26])(=[O:17])[CH3:16]

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 580439603,4,6,7,8,9-Hexahydropyrazino[1,2-a]indol-1(2H)-oneHCID 670165932,6-Dibromo-4-fluorobenzyl acetate

Product 1

HCID 580437762-bromo-4-fluoro-6-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)benzyl acetateYield 60%

Reagents, catalysts & solvents 2

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

Conditions

Temperature
100 °C

Procedure

A 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer was charged with 101g (3.8 g, 20 mmol), 101j (20 g, 60 mmol), XantPhos (1.2 g, 2 mmol), tris(dibenzylideneacetone)dipalladium(0) (1.8 g, 2 mmol), Cs2CO3 (16 g, 50 mmol), and 1,4-dioxane (120 mL). The system was evacuated and then refilled with N2. A reflux condenser was attached to the flask, and the reaction mixture was heated at 100° C. for 16 h. Then, the mixture was 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 5:1 petroleum ether/ethyl acetate to afford 101k as a white solid (5.2 g, 60%). MS: [M+H]+ 435. 1H NMR (500 MHz, DMSO-d6) δ 7.70 (dd, J=3, 1H), 7.48 (dd, J=3, 1H), 6.52 (s, 1H), 5.01 (m, 2H), 4.18 (m, 2H), 4.02 (m, 1H), 3.73 (m, 1H), 2.60 (m, 2H), 2.45 (m, 2H), 1.98 (s, 3H), 1.77 (m, 2H), 1.68 (m, 2H).

Workup

  1. customA 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer
  2. customThe system was evacuated
  3. additionrefilled with N2
  4. customA reflux condenser was attached to the flask
  5. temperatureThen, the mixture was cooled to room temperature
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated under reduced pressure
  8. customthe resulting residue was purified by flash column chromatography
  9. washeluting with 5:1 petroleum ether/ethyl acetate

Sources & evidence

ORD record
ord-e885fbb6005e40339683a4d738442bb5
Source dataset
uspto-grants-2014_05
Patent number
US08722676B2

Reaction notes

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