Potassium Phosphate, Tribasic → HCID 58486752, compound

HRID 874615Notes

Reaction equation

HRID 874615 reaction equation
Br[C:2]1[C:11]([CH3:12])=[CH:10][C:5]2[N:6]=[C:7]([CH3:9])[O:8][C:4]=2[CH:3]=1.[NH2:13][C:14]1[CH:19]=[CH:18][C:17](B2OC(C)(C)C(C)(C)O2)=[CH:16][N:15]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+]>C(#N)C.O1CCOCC1.O.CC(P(C(C)(C)C)C1C=CC(N(C)C)=CC=1)(C)C.CC(P(C(C)(C)C)C1C=CC(N(C)C)=CC=1)(C)C.Cl[Pd]Cl>[CH3:9][C:7]1[O:8][C:4]2[CH:3]=[C:2]([C:17]3[CH:18]=[CH:19][C:14]([NH2:13])=[N:15][CH:16]=3)[C:11]([CH3:12])=[CH:10][C:5]=2[N:6]=1

Participants

8

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 27565555-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amineHCID 58486775HCID 58486775, compound

Product 1

HCID 58486752HCID 58486752, compoundYield 81%

Reagents, catalysts & solvents 4

HCID 11714597Bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II)CatalystHCID 962WaterSolventHCID 6342AcetonitrileSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
85 °C

Procedure

A mixture of 6-bromo-2,5-dimethybenzoxazole (48) (148 mg, 0.65 mmol), 2-aminopyridine-5-boronic acid pinacol ester (11) (171 mg, 1.2 eq), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium (II) (A-Phos) (55 mg) and K3PO4 (137 mg, 0.6 mmol) in 1.5 ml ACN, 1.5 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, dried over Na2SO4, concentrated to dryness. The resulting red solid was dissolved in DCM and subjected to silica gel column purification using 0-100% B (A: hexane; B: EA) to furnish 126 mg 5-(2,5-dimethylbenzoxazol-6-yl)-2-pyridylamine (49) as yellow solid (yield: 81%, purity>95%)

Workup

  1. customwas bubbled with argon
  2. temperatureAfter cooling down to r.t.
  3. washwashed with aq. NaHCO3 and brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated to dryness
  6. dissolutionThe resulting red solid was dissolved in DCM
  7. customsubjected to silica gel column purification

Sources & evidence

ORD record
ord-e9db63f1caa04621a658d9f11b2043a9
Source dataset
uspto-grants-2015_03
Patent number
US08980629B2

Reaction notes

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