Ethyl Acetate → 5-(2-Fluoro-6-methylbenzo[b]furan-5-yl)-pyrazine-2-ylamine

HRID 874674Notes

Reaction equation

HRID 874674 reaction equation
Br[C:2]1[C:3]([CH3:12])=[CH:4][C:5]2[O:9][C:8]([F:10])=[CH:7][C:6]=2[CH:11]=1.[NH2:13][C:14]1[CH:19]=[N:18][C:17](B2OC(C)(C)C(C)(C)O2)=[CH:16][N:15]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+].CC(=O)OCC>C(#N)C.O1CCOCC1.O>[F:10][C:8]1[O:9][C:5]2[CH:4]=[C:3]([CH3:12])[C:2]([C:17]3[N:18]=[CH:19][C:14]([NH2:13])=[N:15][CH:16]=3)=[CH:11][C:6]=2[CH:7]=1

Participants

8

Reactant 4

HCID 8857Ethyl AcetateHCID 62657Potassium Phosphate, TribasicHCID 179989875-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyrazin-2-amineHCID 58487394HCID 58487394, compound

Product 1

HCID 584868455-(2-Fluoro-6-methylbenzo[b]furan-5-yl)-pyrazine-2-ylamineYield 25.4%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6342AcetonitrileSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
85 °C

Procedure

A mixture of 5-bromo-2-fluoro-6-methyl-benzofuran (230) (0.3 mmol), 2-aminopyrazine-5-boronic acid pinacol ester (133 mg, 2 eq), bis(ditertbutyl(4-dimethylaminophenyl)phosphine)dichloropalladium (II) (42 mg, 10% mol) and K3PO4 (127 mg, 0.6 mmol) in 1 ml ACN, 1 ml dioxane, 0.5 ml H2O was bubbled with argon before heated at 85° C. for 2 h. After cooling down to r.t., the reaction mixture was taken up in EA, washed with aq. NaHCO3 and brine. Org. phase was dried over Na2SO4, concentrated and then subjected to silica gel flash column chromatography (0-100% B, A: hexane; B: EA) to give 5-(2-fluoro-6-methylbenzo[b]furan-5-yl)-pyrazine-2-ylamine (234) (18.5 mg, purity>95%, yield: 25.4%) as yellow solid.

Workup

  1. customwas bubbled with argon
  2. temperatureAfter cooling down to r.t.
  3. washwashed with aq. NaHCO3 and brine
  4. dry with materialphase was dried over Na2SO4
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-1b9dae784b524f59b861ac93521072b8
Source dataset
uspto-grants-2015_03
Patent number
US08980629B2

Reaction notes

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