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 519282Notes

Reaction equation

HRID 519282 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 104j (3.8 g, 20 mmol), 104m (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 104n 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-3dda5fe8b0d74c088d2341589f6d29ce
Source dataset
uspto-grants-2015_08
Patent number
US09115152B2

Reaction notes

Loading…