Ethyl Acetate → HCID 90403371, compound

HRID 2278922Notes

Reaction equation

HRID 2278922 reaction equation
Cl[C:2]1[CH:7]=[C:6]([O:8][C:9]2[CH:10]=[N:11][C:12]([N+:15]([O-:17])=[O:16])=[CH:13][CH:14]=2)[CH:5]=[CH:4][N:3]=1.[CH3:18][C:19]1[O:20][C:21](B2OC(C)(C)C(C)(C)O2)=[CH:22][N:23]=1.C([O-])([O-])=O.[K+].[K+].CCOC(C)=O>O1CCOCC1.O.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>[CH3:18][C:19]1[O:20][C:21]([C:2]2[CH:7]=[C:6]([O:8][C:9]3[CH:10]=[N:11][C:12]([N+:15]([O-:17])=[O:16])=[CH:13][CH:14]=3)[CH:5]=[CH:4][N:3]=2)=[CH:22][N:23]=1

Participants

8

Reactant 4

HCID 8857Ethyl AcetateHCID 11430Potassium CarbonateHCID 569730962-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)Oxazole2×HCID 593227792-Chloro-4-((6-nitropyridin-3-yl)oxy)pyridine

Product 1

HCID 90403371HCID 90403371, compoundYield 45.5%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalyst2×HCID 962WaterSolvent2×HCID 312751,4-DioxaneSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of Example A1 (600 mg, 2.38 mmol), 2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)oxazole (648 mg, 3.10 mmol), K2CO3 (989 mg, 7.15 mmol) and Pd(PPh3)4 (138 mg, 0.119 mmol) in dioxane (8 mL) and water (2 mL) was sparged with Ar and heated at 80° C. overnight. Additional 2-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)oxazole (100 mg) and Pd(PPh3)4 (50 mg) were added, the mixture heated at 80° C. for 5 h, then cooled to RT and treated with water and EtOAc. The solids were removed via filtration through diatomaceous earth, the layers of the filtrate separated and the organic layer was washed with brine, dried over Na2SO4, concentrated to dryness and purified via silica gel chromatography (MeOH/EtOAc) to afford 2-methyl-5-(4-((6-nitropyridin-3-yl)oxy)pyridin-2-yl)oxazole (323 mg, 45%). MS (ESI) m/z: 299.1 (M+H+).

Workup

  1. temperaturethe mixture heated at 80° C. for 5 h
  2. temperaturecooled to RT
  3. customThe solids were removed via filtration through diatomaceous earth
  4. customthe layers of the filtrate separated
  5. washthe organic layer was washed with brine
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated to dryness
  8. custompurified via silica gel chromatography (MeOH/EtOAc)

Sources & evidence

ORD record
ord-1e0a3566712d4674835ff179f67dba0f
Source dataset
uspto-grants-2015_09
Patent number
US09133183B2

Reaction notes

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