Potassium Phosphate, Tribasic → 2-Methyl-8-(5-phenyl-2-pyridinyl)benzofuro[2,3-b]pyridine

HRID 1844930Notes

Reaction equation

HRID 1844930 reaction equation
[CH3:1][C:2]1[N:7]=[C:6]2[O:8][C:9]3[C:14](B4OC(C)(C)C(C)(C)O4)=[CH:13][CH:12]=[CH:11][C:10]=3[C:5]2=[CH:4][CH:3]=1.Cl[C:25]1[CH:30]=[CH:29][C:28]([C:31]2[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=2)=[CH:27][N:26]=1.C1(P(C2CCCCC2)C2C=CC=CC=2C2C(OC)=CC=CC=2OC)CCCCC1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>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].O.C1(C)C=CC=CC=1>[CH3:1][C:2]1[N:7]=[C:6]2[O:8][C:9]3[C:14]([C:25]4[CH:30]=[CH:29][C:28]([C:31]5[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=5)=[CH:27][N:26]=4)=[CH:13][CH:12]=[CH:11][C:10]=3[C:5]2=[CH:4][CH:3]=1

Participants

8

Reactant 4

HCID 62657Potassium Phosphate, TribasicHCID 27628682-Chloro-5-phenylpyridineHCID 112698722-Dicyclohexylphosphino-2',6'-dimethoxybiphenylHCID 901214882-Methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine

Product 1

HCID 901216732-Methyl-8-(5-phenyl-2-pyridinyl)benzofuro[2,3-b]pyridineYield 42.3%

Reagents, catalysts & solvents 3

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 962WaterSolventHCID 1140TolueneSolvent

Procedure

A mixture of 2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine (3.0 g, 9.70 mmol), 2-chloro-5-phenylpyridine (2.024 g, 10.67 mmol), Pd2(dba)3 (0.178 g 0.192 mmol), dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine (0.319 g, 0.776 mmol), potassium phosphate (7.21 g, 34.0 mmol), toluene (70 mL) and water (7 mL) was degassed with nitrogen and then refluxed overnight. It was concentrated and extracted with ethyl acetate. The ethyl acetate layer was dried on Na2SO4 and then further purified by column chromatography using ethyl acetate in hexanes to give 2-methyl-8-(5-phenylpyridin-2-yl)benzofuro[2,3-b]pyridine (1.38 g, 4.10 mmol, 42.3% yield).

Workup

  1. customwas degassed with nitrogen
  2. temperaturerefluxed overnight
  3. concentrationIt was concentrated
  4. extractionextracted with ethyl acetate
  5. dry with materialThe ethyl acetate layer was dried on Na2SO4
  6. customfurther purified by column chromatography

Sources & evidence

ORD record
ord-c5510a6857ab456ca187c14e7b28f700
Source dataset
uspto-grants-2015_02
Patent number
US08946697B1

Reaction notes

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