Cesium carbonate → 6-Chloro-4-(5-((3R,5S)-3,5-dimethylmorpholine-4-carbonyl)pyridin-2-ylamino)-2-methylpyridazin-3(2H)-one

HRID 1412078Notes

Reaction equation

HRID 1412078 reaction equation
[NH2:1][C:2]1[N:7]=[CH:6][C:5]([C:8]([N:10]2[C@@H:15]([CH3:16])[CH2:14][O:13][CH2:12][C@H:11]2[CH3:17])=[O:9])=[CH:4][CH:3]=1.Br[C:19]1[C:20](=[O:27])[N:21]([CH3:26])[N:22]=[C:23]([Cl:25])[CH:24]=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>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>[Cl:25][C:23]1[CH:24]=[C:19]([NH:1][C:2]2[CH:3]=[CH:4][C:5]([C:8]([N:10]3[C@@H:15]([CH3:16])[CH2:14][O:13][CH2:12][C@H:11]3[CH3:17])=[O:9])=[CH:6][N:7]=2)[C:20](=[O:27])[N:21]([CH3:26])[N:22]=1

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 592164744-Bromo-6-chloro-2-methyl-2,3-dihydropyridazin-3-oneHCID 86684570(6-Aminopyridin-3-yl)((3R,5S)-3,5-dimethylmorpholino)methanone

Product 1

HCID 866845736-Chloro-4-(5-((3R,5S)-3,5-dimethylmorpholine-4-carbonyl)pyridin-2-ylamino)-2-methylpyridazin-3(2H)-oneYield 37.1%

Reagents, catalysts & solvents 2

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

Procedure

A 25-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with (6-aminopyridin-3-yl)((3R,5S)-3,5-dimethylmorpholino)methanone 320a (235 mg, 1.0 mmol), 4-bromo-6-chloro-2-methylpyridazin-3(2H)-one (232 mg, 1.05 mmol), cesium carbonate (652 mg, 2.0 mmol), and 1,4-dioxane (6.0 mL). After bubbling nitrogen through the suspension for 10 minutes, Xantphos (116 mg, 0.20 mmol) and tris(dibenzylideneacetone)dipalladium(0) (70 mg, 0.10 mmol) were added. The system was subjected to three cycles of vacuum/nitrogen flush and heated at reflux for 2.5 h. It was then cooled to room temperature and filtered. The solid was washed with dichloromethane (3×10 ml). The combined organic layer was concentrated under reduced pressure. The residue was purified by silica-gel column chromatography eluting with petroleum ether/ethyl acetate (2:1 to 1:10) to afford 321a (140 mg, 37%) as a yellow solid. MS-ESI: [M+H]+ 378.3

Workup

  1. customA 25-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter bubbling nitrogen through the suspension for 10 minutes
  3. customflush
  4. temperatureheated
  5. temperatureat reflux for 2.5 h
  6. filtrationfiltered
  7. washThe solid was washed with dichloromethane (3×10 ml)
  8. concentrationThe combined organic layer was concentrated under reduced pressure
  9. customThe residue was purified by silica-gel column chromatography
  10. washeluting with petroleum ether/ethyl acetate (2:1 to 1:10)

Sources & evidence

ORD record
ord-b767da7419d64436a7e4b08e3cdbd25b
Source dataset
uspto-grants-2014_12
Patent number
US08921353B2

Reaction notes

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