3-Bromo-2-fluoropyridine → 4-(2-fluoropyridin-3-yl)-1-methyl-5,6-dihydropyridin-2(1H)-one

HRID 473722Notes

Reaction equation

Br[C:2]1[C:3]([F:8])=[N:4][CH:5]=[CH:6][CH:7]=1.[CH3:9][N:10]1[CH2:15][CH2:14][CH:13]=[CH:12][C:11]1=[O:16].C1(CNCC2CCCCC2)CCCCC1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O1CCOCC1>[F:8][C:3]1[C:2]([C:13]2[CH2:14][CH2:15][N:10]([CH3:9])[C:11](=[O:16])[CH:12]=2)=[CH:7][CH:6]=[CH:5][N:4]=1

Participants

Conditions

Temperature: 100 °C

Procedure

Into a sealed tube were placed 3-bromo-2-fluoropyridine (0.10 g, 0.60 mmol), 1-methyl-5,6-dihydropyridin-2(1H)-one (0.134 g, 1.20 mmol), bis(tri-tert-butylphosphine)palladium (0) (0.046 g, 0.09 mmol), N,N-dicyclohexylmethylamine (0.13 mL, 0.66 mmol), and 1,4-dioxane (0.5 mL). After the mixture was degassed for 5 min, the reaction was heated at 100° C. for 3 h. The cooled reaction was concentrated in vacuo, and the brown residue was directly purified via flash column chromatography (20% EtOAc/Hexanes to 100% EtOAc) to give 4-(2-fluoropyridin-3-yl)-1-methyl-5,6-dihydropyridin-2(1H)-one as a tan solid. MS (ESI, pos. ion) m/z: 207.1 (M+1).

Workup

customInto a sealed tube were placed
customAfter the mixture was degassed for 5 min
customThe cooled reaction
concentrationwas concentrated in vacuo
customthe brown residue was directly purified via flash column chromatography (20% EtOAc/Hexanes to 100% EtOAc)

Sources & evidence

ORD record: ord-23564981b45e4d74810db1123bb48f14
Source dataset: uspto-grants-2014_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08637500B2

Reaction notes

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